Malicious PDF — malware analysis report

Static analysis result for SHA-256 027680bfc43fa024…

MALICIOUS

PDF

87.4 KB Created: 2021-03-09 13:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1e0e685dd606c3406be79c1ed782b23a SHA-1: b6e48e027e38fa42a8bb02053c083f3db124e901 SHA-256: 027680bfc43fa024ad27bdff313e3f2c00bd593e43f0d581ae78a4d46380d674
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent external URI, 'https://fokemale.ru/wix?keyword=antivirus+apk+full', suggests a lure related to antivirus software, potentially leading to malware downloads. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/wix?keyword=antivirus+apk+full PDF link annotation
    • http://vodoroding.info/dragon_age_origins_denerim_questslisut.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/muganejuvojof7xfx6.pdfIn PDF document text
    • http://letxxnx.org/213624801809t11d.pdfIn PDF document text
    • http://hookup666.site/college_english_placement_test_practice_questionsbvguq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d0830e-6a72-41df-9751-581f3d28c1a1/81058104630.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/dedomuximarofosobozijikuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af78c7db-8825-499a-98b9-8808f72ba962/holmes_humidifier_filter_hwf75.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b9fac8-ba44-47e8-8239-0af48af3ebe5/liramiruxagigita.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_66ccb806946c4bcc9c8e4ba7d075ea52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/cricket_19_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/bmtc_bus_routes_and_numbers_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/71103198381.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/11277415113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/957bfef8-9ae4-4983-a3ef-4af3289045ee/apollo_twin_x_quad_review.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_ed42ad12be9d4dc2a576480568694a20.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_a6e916a328b84dd78211a8f28e6c7898.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_ca32faf57c734e70830b804f656dc651.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_fb60e3d570d94f4b92eeddca32f624bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/vehicle_maintenance_log_book_template.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_7c3344842b974504ba2341de02026658.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovibu/97211386183.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_0b263816217945e4b97fe8c31aff2c71.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 5008 bytes
SHA-256: 42ff7ad02a7387721170f3b56b664638a53578539fa17c1b0e067bc934f270f7
font_01_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 10368 bytes
SHA-256: 8b4eaa9af05b1896e6ff0bc45bb45bbc54eb1f37060e88ad1e4d379fe28b4a69