Malicious PDF — malware analysis report

Static analysis result for SHA-256 72506cab6aeba223…

MALICIOUS

PDF

77.7 KB Created: 2021-06-12 08:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6685ab274fbef6565875b1ed7d42a10 SHA-1: 26b15f11a8510d7d9e5e10849c0d517a2a933dc1 SHA-256: 72506cab6aeba223e320c913106110ec15d712e0dd43d455c383b8495b516651
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be search engine optimization content, specifically referencing 'Emerson self reliance essay pdf'. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to potentially malicious or ad-filled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pistant.ru/pbw?utm_term=emerson+self+reliance+essay+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480755/normal_605a0f326abc6.pdfIn PDF document text
    • https://jusodudefepad.weebly.com/uploads/1/3/4/6/134650432/buneroxuzubuto_rivefilag.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/wataz.pdfIn PDF document text
    • https://mokefogo.weebly.com/uploads/1/3/6/0/136086775/bupojedekon-vozezis-mejuvewizofuko.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/mimomebuda.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/726aced27aca368.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/xopepokasejane.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/8b7097c28569e.pdfIn PDF document text
    • https://defeluzeveloj.weebly.com/uploads/1/3/0/8/130873982/pipakapafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_60167f61ef22a.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/kemowavige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6010cbcd04eba.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/fae95a96-8f7f-4b64-ac9d-49f22ef2a69b/fidagupegigidigoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3d5bd8-61f1-4e5f-b6f3-ff4a7f270868/how_to_start_a_suburban_with_the_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b0e9af-58af-4321-a503-5ead9b109c7e/67910319600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7eb78a0-9301-47e3-a345-eccea7cc3be7/clash_of_clans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa482ef-d4f9-40d0-9a32-07245a0bd64b/10_x_10_grid_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f653dc9-4ed6-467b-b718-07bcec313dc2/36705266890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f29573c-f489-4481-b5f0-96473433e369/89684218785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8603ea-37b5-461b-8fca-44ed503e54d8/zizisudojisutudiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49775084-de78-4c40-9278-2949186fe743/suction_dilation_and_curettage_under_ultrasound_guidance_cpt_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10774f4-2343-439a-9ea4-ded9607dc9ab/possessive_nouns_worksheet_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca005d8-1b32-47ac-8f66-e64001ba9ef1/10835586195.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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 5360 bytes
SHA-256: 6bef340974d05faed04e6448cac78f512909e991ba5bbf7e5b1bbad8cf8993f6
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 12176 bytes
SHA-256: 4eff10966163080d152254cf388d45d7e1ee3d674047aa7ae1b73a67dcaebe47