Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca309b543a57d7aa…

MALICIOUS

PDF

90.1 KB Created: 2021-03-29 21:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4118a8f391177732157b2cc0ddf1b01b SHA-1: 1a9267632217039da51b74a4896b4934cb306752 SHA-256: ca309b543a57d7aa55eed445202103d721bab2d4abfb76fc39066233712bd60b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common technique for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=atonia+uterina+tardia+pdf PDF link annotation
    • http://hesap-al-sat.com/bevesixamefikoj86usc.pdfIn PDF document text
    • http://detonic-shop.website/dafajimepenifajebumenoct2v9.pdfIn PDF document text
    • http://mihetos.xyz/27726927163vlycs.pdfIn PDF document text
    • http://eushopvmn.site/kenanigigex5q8dx.pdfIn PDF document text
    • http://artyom.guru/past_tense_and_present_tense_worksheets17xtl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/posufij/25086357969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1105e41a-e99f-4b29-aaf1-4e81e45e1034/sharepoint_2013_cumulative_update_installation_of_this_package_failed.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_823a8c35e0054bee99d020457b029a43.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_1894f95cd45146aa97e041ee49c160aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfe0949-b923-4111-91f0-544bfeabd9b4/what_is_network_unlock_code_for_att.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_0bccf267876444b5a9d6473b318af43a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/mubapuzovib.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/broken_heart_girl_image.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_fddea94791dc43d78a2b7acb4365b5f5.pdf?index=trueIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_5b5ef74843f6495189193f574f80fb23.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_456a8a1db09c4236a4c7670ec6a9f1ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72570e0b-e336-46b7-8af8-d579dab7635e/best_commercial_coin_operated_washer_and_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/xefevowixokazadolejorewa.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/liftmaster_8355_garage_door_opener_reviews.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_cfaec318ba9441a7bd49673d76f97322.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/176e4808-ccfa-470f-a139-4493b4b4525a/japevetutifu.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/how_to_get_the_search_bar_back_on_chrome.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_028dda37b18342278f289dbc077e680c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/potopavoruvi.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/7699966243.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_60ba7d63d6a6430d824ee17b9105dea5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fce0c21-c574-46da-a60d-8e16bc81ed73/gugur.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/72386949414.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/nordictrack_commercial_1750_treadmill_specifications.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 4696 bytes
SHA-256: 050ee7fea2ed18650f67339d5ea6be1c86fa4b7d977d6d26eee5932781e205ca
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 13788 bytes
SHA-256: caf45a9d8eec1d27725f4450a18b99d36672b17e04265fc1fe5e2d4a940d971c
font_02_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off00014a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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