Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0a8f5905b73fa8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 460c27b8e6f6cbe3b0be0edff231a867 SHA-1: aeeba73f7e605d22e23aaf2503c3a5c6c36e4807 SHA-256: 6e0a8f5905b73fa8e017e14b03defa4b04550b98a47170e7028737e5c306ac75
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature. The primary lure appears to be disguised as 'linear algebra practice problems pdf', directing users to a redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/award?keyword=linear+algebra+practice+problems+pdf PDF link annotation
    • https://cdn.sqhk.co/gimowiboxero/acRiihb/denon_receiver_audio_cuts_out.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/difanojovajibavas.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/tukasoja.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/vezafabobofipu.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/KpMEigG/osu_stream_companion_not_working.pdfIn PDF document text
    • http://setopin.mypressonline.com/56944936710.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/jhUWifz/watozexijupar.pdfIn PDF document text
    • https://tixilumudesowor.weebly.com/uploads/1/3/6/0/136095614/niguz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikasipab.epizy.com/dosesib.pdfIn PDF document text
    • http://fewuzefar.rf.gd/fazoweve.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/i_am_so_lonely_song_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/new_union_minister_of_information_and_broadcasting.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/android_studio_test_keyboard_shortcut.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_11f60d04b52243149fa2049dcc42fae5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/33491249596.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_9ef2c037ae3743a0b258bc485c101bc4.pdf?index=trueIn PDF document text
    • http://dixasimoxipux.rf.gd/graco_bassinet_swing_recall.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/subject_verb_agreement_worksheets_with_answers_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/vepatarogomoxapubisa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 5556 bytes
SHA-256: f3898a67e4cd717d1352d9a2b064f7421de5f60d1c877476738aa77172054b67
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 11508 bytes
SHA-256: 1ad3d652b43d6461420e5ecd62cd168c0214ae648fb02b498b62dc61fef0aec0

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