Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f91ddbf3cccfd53…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 02:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a97b8a6dea49bab72740f3ae0413452 SHA-1: 75b01ad526d7b74b5ffdf8f59a93cae995c3d9c2 SHA-256: 1f91ddbf3cccfd533538fe33e09fda4545c8078d57699ed3c988b7d2f4881e3b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on suspicious domains and are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs suggest an attempt to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=istanbul+tatili+filmi+full+izle
    • https://ferosikapomizud.weebly.com/uploads/1/3/4/5/134526037/betataxajegiko.pdf
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/bepunaberi.pdf
    • https://cdn-cms.f-static.net/uploads/4403808/normal_6058ba8a1c1a6.pdf
    • https://cdn-cms.f-static.net/uploads/4379220/normal_605865f9ca676.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_6026ecd58206d.pdf
    • https://cdn-cms.f-static.net/uploads/4485436/normal_60496cbb9e9ee.pdf
    • https://cdn-cms.f-static.net/uploads/4426088/normal_606e87d8e51c0.pdf
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5ff20236c80e6.pdf
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/6e95fafb29e4.pdf
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5ffa31b7556ff.pdf
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/vevufofakamag-wabulokom.pdf
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/bimug.pdf
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/fb469.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83fb8b09-365f-49cf-98b0-67aa43e77365/witcher_3_hearts_of_stone_good_ending_guide.pdf
    • http://niwomif.pbworks.com/f/89028019831.pdf
    • https://uploads.strikinglycdn.com/files/230ff0c1-0c78-4b3a-93b5-a8642144f81d/76512928983.pdf
    • https://uploads.strikinglycdn.com/files/593f7dbc-fbd1-4a33-9878-37f5fb07c637/longman_phrasal_verbs_dictionary_free_download.pdf
    • https://uploads.strikinglycdn.com/files/400e47fc-b905-4453-846b-0b8ccf704a36/vadejebu.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144422967/the_conjuring_2_full_movie_in_tamil_download_isaimini.pdf
    • https://uploads.strikinglycdn.com/files/37a83e3f-470c-4151-8198-3d25da97e800/denufobebubag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e199.bin
5fe8cda0593681d212e020491cab2f3d1871ebd1f7071ea4f5043f19b34aabc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 4944 bytes
font_01_sfnt_off0000f266.bin
e64eb7892c8ee754e987f20172b8c51417c6f44e388dd93b50682b06802b2a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 11644 bytes

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