Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd6356eae771ca9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 21:32:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d97bf0f73f7476aee9f674e134a42577 SHA-1: 8f00d49ff320153b430ce3a78c9861f12ee6f411 SHA-256: 1fd6356eae771ca916ba4cb6b20a51d386607b70e5e38a5dd97b14b766178a42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be related to study guides, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=comptia+security%252B+study+guide+pdf+2020 PDF link annotation
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/giwuwu.pdfIn PDF document text
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/busepukumezovaz.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/bipimonusikepef.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/ehe0j3x/harry_potter_animal_crossing_island_dream_codes.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/91a25f0.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/9336067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd1decf25ad9.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/8178570.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/giRAiie/real_stickman_crime_2_mod_apk.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/9464028.pdfIn PDF document text
    • http://peteferix.mypressonline.com/lotofik.pdfIn PDF document text
    • http://gojuwogerex.iblogger.org/porter_cable_fn250sb_how_to_load.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/9160260.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/8f0d77a.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jjhdQih/zavujiwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikobonojaxax.epizy.com/69692490195.pdfIn PDF document text
    • http://dojopugoput.epizy.com/wizelivifemegosumakivoba.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/mawawisofidawiw.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/emerson_led_tv_turns_off_after_5_seconds.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_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 5724 bytes
SHA-256: e928d23691b64ef1800d5dae296032a4b68f50ffc348d9139c0a683373a4d08f
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10908 bytes
SHA-256: 8d49752ee26b0db34f5ebdc81efe16c0674a76a170b82dbbf59548fd25c8a1a2

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