Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc354b408641aba…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 21:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8eb585be4eb1b7b674e1b5408f9b6b8b SHA-1: 944cc7702ebbd6b8dc498583dd95d9a71b59bb6e SHA-256: fdc354b408641aba420961bd4b1539bd6a22b680c8237a521060892413731f54
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jottigo.ru/strik?utm_term=libro+de+fisica+2+secundaria+2020+sep PDF link annotation
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/posev_nuduxelukodup_liwewi_ratib.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/kigatafofinaxoxezelo.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/kenatukak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366041/normal_5fdef1fb34b09.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/susuz.pdfIn PDF document text
    • https://gezifizisosuvul.weebly.com/uploads/1/3/6/0/136050083/mumivaronunatoravuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fce9d8ad3de4.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/formal_informal_colloquial_diction_examples.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/muxuduvosoletenevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_60158c918e325.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/1036217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_601c630ab2f15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wexukufedepim/oxidation_reduction_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/7096288893.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/97481530242.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/10878395646.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/28709509513.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 5276 bytes
SHA-256: 16e9e108a777f0093556538ca4f0ad376635bcb7488f2978f916711aeb75f8bd
font_01_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 11836 bytes
SHA-256: ff390e57c16dc7f2a520a5658443a0610341b062717fac17683f7858614e99e6
font_02_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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