Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac58fb1f8dfca332…

MALICIOUS

PDF

82.5 KB Created: 2021-04-01 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eaf7babec02bef13f1ac51a3201dcb69 SHA-1: f7e8dcd28b7175d8adc2c66a7b63f6f85d763b1f SHA-256: ac58fb1f8dfca332934f5515bbfa02c3452e8c3ee1b414125c6224a944685425
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=ac126+transistor+datasheet+pdf PDF link annotation
    • http://xikewimuvos.iblogger.org/canon_in_d_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_603f7dc73d975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_60200331b25cf.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/b7d67d9.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/mesebob-fatupisag.pdfIn PDF document text
    • http://subonus.ru/line_6_helix_lt_carrying_casealsuo.pdfIn PDF document text
    • http://help-verification.com/the_history_of_love_bookxgs1z.pdfIn PDF document text
    • http://citruss.space/fapeloloserifog48.pdfIn PDF document text
    • http://kasewokagirit.iblogger.org/lezanaloxarusize.pdfIn PDF document text
    • http://sayfelengs.space/nuxatujamefoxafoeiavi.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/e075d493-ff63-46a0-8c7c-2c193abf5710/43417987323.pdfIn PDF document text
    • http://fejetowetut.rf.gd/keto_diet_easy_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483eda3c-b227-48be-92d5-3b199a2e1b42/wabiwumifelun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906c191c-a52b-4fe5-93d5-cd79e5ea9ac6/zuvakajoferomelos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c674076-93be-4553-bccb-fbb15c9f7bfc/que_significa_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387997fe-d81c-43d9-bd2b-cfb4d87fe806/how_do_you_write_a_chemical_equation.pdfIn PDF document text
    • http://tafinefonekon.rf.gd/beps_action_plan_8_to_10.pdfIn PDF document text
    • http://bawokexumavi.epizy.com/28138934027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf53b00-e017-4c57-9e0c-0dc3166d443f/petok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d5d324-9d96-44fc-8127-78858bd2eac0/what_do_moon_rocks_tell_us.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 4324 bytes
SHA-256: e90a14e73565ba88b36963f6fc6f879e1bd1a94b9e6cb7521e1713036b1e2dcc
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 5536 bytes
SHA-256: 6fcd900b723ce9b14734e53ade04715d4c9b32171511e893ed32ae90d39ae7a8
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 13164 bytes
SHA-256: 0cbf1a51b88d1265f04513915383be918eef6cef5236e461d91cdedf859c68e4