Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18a6648842160d8…

MALICIOUS

PDF

85.1 KB Created: 2021-03-28 17:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56f15bd8b9534120cf3dc5c6f6af36aa SHA-1: 79cadb9d0ccc8378fa8197bed76576b10ec6774b SHA-256: d18a6648842160d8f413ce456b924c4554724ec320c89664353b60555400cc09
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm, with numerous external URLs designed to distribute other PDFs. One prominent URL, zajinet.ru, is presented as a "high school life essay pdf" to entice clicks. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=high+school+life+essay+pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_6032a25f337ed.pdf
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/xokiwopuxix_fivinuj.pdf
    • https://ramaxudefe.weebly.com/uploads/1/3/4/0/134042793/gawumobu.pdf
    • https://derodukiv.weebly.com/uploads/1/3/1/4/131453370/3277ae0f7f.pdf
    • https://sulumakopata.weebly.com/uploads/1/3/0/7/130775191/903964fc4dbb3.pdf
    • https://binelotetite.weebly.com/uploads/1/3/4/0/134016953/goduralari-vifuxetizef.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_601d88bf085b9.pdf
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/552897.pdf
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/9702508.pdf
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/sedete_samuf.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/nilovigidifafugidok.pdf
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/7fd6054119c.pdf
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/bupegad.pdf
    • https://lejujika.weebly.com/uploads/1/3/5/3/135338339/67f6aef26d.pdf
    • https://static.s123-cdn-static.com/uploads/4375344/normal_60034f1768814.pdf
    • https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/acec22d9ebb.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/majiruwatamevurod.pdf
    • https://refamulu.weebly.com/uploads/1/3/4/8/134886446/gebizowufadaniw-zasozaropumifi-mekomipapi-tunevumobite.pdf
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/kunanatofifa_jikafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/roware/cbc_manual_differential_blood_test.pdf
    • https://s3.amazonaws.com/zowejunef/arabic_keyboard_android_2._3._6.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/16513272148.pdf
    • https://s3.amazonaws.com/gomakobez/vudegekeramuvido.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_off00010f8b.bin
95a7fae36fbde297cd3c6fd632b92e69d17e90756c40d6e09a897d607da199f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 5384 bytes
font_01_sfnt_off000121f2.bin
f847d3799a413538505afc0fd3ce9b2f6697873dbff88c737b8748d6b630b1f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 10792 bytes

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