Malicious PDF — malware analysis report

Static analysis result for SHA-256 df847f913521591d…

MALICIOUS

PDF

75.5 KB Created: 2021-06-06 19:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a84f8f98e5cd6c170ee4aef40b90d5c7 SHA-1: 57fef346fa9bf4678c976deaf47d84bc21e5c714 SHA-256: df847f913521591dcb931114a00f128e1a942d68e227f111f8ba219b5c5aa617
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://laborke.ru/pbw?utm_term=reported+speech+interrogative+sentences+exercises+pdf PDF link annotation
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/pizepa.pdfIn PDF document text
    • https://batopida.weebly.com/uploads/1/3/4/6/134689087/mujolitetumeposadeto.pdfIn PDF document text
    • https://jazujuwomukoti.weebly.com/uploads/1/3/4/6/134684961/9d8be9b8eba.pdfIn PDF document text
    • https://tanipodolotuweb.weebly.com/uploads/1/3/4/4/134457000/watokuwilezesu.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/2106568.pdfIn PDF document text
    • https://xanalefude.weebly.com/uploads/1/3/1/4/131411596/bb5a1d2101a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144424338/tagonopukujuzedag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7652f5f8-0563-4835-9901-e30622a9033b/panasonic_es-la63_replacement_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2862b6-4957-4605-83f3-831368377c84/zemefako.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/kejejunewosomufew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee22f8f7-9af9-41e1-a263-00592c05aab0/3146492565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d6da65-90cb-4d02-bac0-f9d35b7444db/zopilokutososawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379f5ada-c087-4f52-95fb-d913a95b3884/95119466925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68591756-bd8e-4609-a311-708c415d7eb0/the_making_of_the_west_volume_2_5th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4fda8e7-ab69-4cd5-b174-a6d79df57835/sopa_de_letras_para_imprimir_para_nios_de_tercer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460141b6-42f8-4aa6-86ab-2bfc97c169bd/fabedaxatogamuxowuxelezed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94685ca1-7ced-49f3-b936-f125a48d4083/how_to_find_gradient_of_scalar_field.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144542505/92959207868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2beba18-5f55-49f5-ba41-e71d0f35d416/76867176839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f295ff3-0d73-42c2-b818-f03241652d2e/estudios_biblicos_para_la_vida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2465b8-3b4e-4c42-b581-9244e8e7bbfd/how_to_beat_madame_butterfly_sekiro.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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5520 bytes
SHA-256: 30e1f87fcb81f40d807eac2170ae7155ace9e3f5752790d24e4303d69429eb6d
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 11000 bytes
SHA-256: 50293f49f3ba18e853829c9b7cb792f830f9425c0fb62c5ba2f29a30ce9d1000