Malicious PDF — malware analysis report

Static analysis result for SHA-256 39083d16c736b829…

MALICIOUS

PDF

69.0 KB Created: 2021-02-11 22:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c7c29b8611c2a2ee797214307ee37d40 SHA-1: 4ed095c7d0ab5ccc30fbf2053ebbb49e40058ae0 SHA-256: 39083d16c736b829540b24fc424d8c7b3d9254eba1f0120819657473501af6de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://jacksth.ru/123?utm_term=high+phosphate+group+transfer+potential PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600e4cbb1f06a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5ff0da4b772d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5ff247b6e235c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467936/normal_5fed159048729.pdfIn PDF document text
    • http://jitokinut.iblogger.org/auto_insurance_quote_request_form.pdfIn PDF document text
    • http://vanlit.ru/3225379634732pyh.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/80d90.pdfIn PDF document text
    • https://tukareteran.weebly.com/uploads/1/3/5/3/135307171/wozovobil_jisubafaxoxuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegugus/gajokipezunuseb.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/56801594671.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/85139656065.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/fromm_heartland_gold_puppy_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/life_cycle_of_ascomycetes.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/business_plan_format_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/uss_answer_key_2019_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/85404606641.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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 5124 bytes
SHA-256: 8951141203e7793af8bd1974692b6cbbabaa7f0d9dfa20fcff88b7b8158e63e5
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10528 bytes
SHA-256: affc5e7213881cd781ae7f730c1d1621a98b3e0ae5380767223ecc7e274484e1

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