Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc4e18c265a12a3…

MALICIOUS

PDF

84.0 KB Created: 2020-12-01 12:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a333035b9df58be755a25055abf61fc SHA-1: 11f148822a948e8ed0a527d6c31af9288e12f0ed SHA-256: 3bc4e18c265a12a3377ad2d2c38df776dcf3706a92bfd5d6d0c829431fd94652
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm or a phishing lure. The document body, though heavily obfuscated, contains text related to academic problems, suggesting a pretext for the embedded links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=monohybrid+and+dihybrid+problems+answers
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5faa2b333a54e.pdf
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8e553cad729.pdf
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/zapetuserajudibogam.pdf
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/rizis_mobiwasamep_xurako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jiguwuzobozobaz/invitation_letter_to_an_event_sample.pdf
    • https://s3.amazonaws.com/wofaxil/pidodowerenoki.pdf
    • https://s3.amazonaws.com/nevowimo/zutepinuwetube.pdf
    • https://s3.amazonaws.com/gopuze/duzuwawasaf.pdf
    • https://s3.amazonaws.com/fifomi/vatigawadadibig.pdf
    • https://s3.amazonaws.com/xanebavifamopez/dufosuge.pdf
    • https://uploads.strikinglycdn.com/files/02d21a4e-2de4-42f1-968a-010db92f70f2/8603581489.pdf
    • https://s3.amazonaws.com/ribowexulo/west_african_proverbs.pdf
    • https://s3.amazonaws.com/tetofamuxulil/amway_product_price_list_in_india_2018.pdf
    • https://uploads.strikinglycdn.com/files/6e9bdd4b-ca78-4773-9c71-0b56f368dcce/12550582957.pdf
    • https://s3.amazonaws.com/jedobufudajewu/vafizurijafazexaworelak.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/jakomijaragopopu.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001109c.bin
748cb81e879e74ae6265aca7c6da9c9441ced165b6021ff79c4afaaf546accec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1109C 28720 bytes
font_00_sfnt_off0000d964.bin
e89452b67cb55ff67bc46f2c527a70880fe9085cdffa4f7b33201467b8006a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 5536 bytes
font_01_sfnt_off0000ec23.bin
01dc752ff6d5fc92829c2de298218828707fd0731dfedc7e176c1dc061eff727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 10696 bytes

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