Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f5c9d872114055…

MALICIOUS

PDF

71.5 KB Created: 2021-02-28 16:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d5659cd200f2ec651862beb5366859ad SHA-1: b4dcee386252ed5cf220a3983c3aff32235b80c4 SHA-256: b6f5c9d8721140555e2374d4e0928247172a05b39202d9570e7c978dd2eba5cc
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 0.9998

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.
  • 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://bologen.ru/123?utm_term=que+es+homologar+un+titulo PDF link annotation
    • http://musc-media.xyz/vawitefafekosefiguvas84.pdfIn PDF document text
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/togebedeni_zimup_pivix.pdfIn PDF document text
    • http://austritkfa.com/android_10_gesture_navigation_back_buttonogcwo.pdfIn PDF document text
    • https://tizetenu.weebly.com/uploads/1/3/3/9/133999913/jadisiferitenapa.pdfIn PDF document text
    • http://storeplus.pro/couch_to_5k_free_appx6zwg.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/tizivonusolaje.pdfIn PDF document text
    • https://davufafelasipip.weebly.com/uploads/1/3/4/3/134328138/gisexajavovelenikir.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/dusorexinitaxavika9crc6.pdfIn PDF document text
    • http://folivapizi.66ghz.com/ammonium_formate_solubility_in_methanol.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/b64eca.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/5ced0b5ddf2da1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezuzatutuxi.epizy.com/pediatric_intensive_care_unit_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/56239907116.pdfIn PDF document text
    • http://jepisaf.epizy.com/guidelines_in_practice_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/85711865001.pdfIn PDF document text
    • http://tifureboriva.epizy.com/57123337678.pdfIn PDF document text
    • http://gawadatij.rf.gd/bourdon_test.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/mensa_practice_test_iq_score.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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 5160 bytes
SHA-256: b055dd0fe4aed3e5b7a8ba6b12efa117dafeec1b0698072cd596497827b837da
font_01_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 10804 bytes
SHA-256: c94b12e8a135b430fbaf1067320d33be6f5cc885b280339096ac79f42ce9d8d2

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