Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f8c4797027b6f5…

MALICIOUS

PDF

74.9 KB Created: 2021-03-24 08:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ec8c77936e12da50606670af10dc8da SHA-1: 56487e2360b4273874afbe8a816212fb7a86edb7 SHA-256: b1f8c4797027b6f51a9134ef0459f67847aaa0561473cd76a125728856a807e8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=2007+nissan+quest+repair+manual PDF link annotation
    • https://cdn.sqhk.co/kusewupudin/8Nhijhk/broken_dawn_2_hd_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/hdrUge5/mashed_potatoes_bon_appetit_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/jbih1jb/iphone_hidden_text_app.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/1921603.pdfIn PDF document text
    • https://bupotovivo.weebly.com/uploads/1/3/3/9/133986694/tasewasaz.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/608562f492cca.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/fuberezub.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/levodopa_davis.pdfIn PDF document text
    • https://pokenavij.weebly.com/uploads/1/3/4/8/134892290/9624744.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/mowivuxuwofa-nidumadunakinix.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/study_bible_kjv.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/terapia_cognitivo_conductual_insomnio.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/hhhajjB/survivalcraft_2_apk_download_pc.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/lapob_kaluti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govepagigugig.rf.gd/3608874543.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/cardboard_vr_games_apk.pdfIn PDF document text
    • http://fosekor.epizy.com/ipcc_special_report_on_land_degradation.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/vumifegafekodadotufelo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5348 bytes
SHA-256: cf004526ea184bb458c7aa0b7e5bd23e358ccf9fc77921c1dd80db7052dd4f31
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 11660 bytes
SHA-256: 920371040f01456ce585815c33b51432077117467f34be02956948420c2fd256

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