Malicious PDF — malware analysis report

Static analysis result for SHA-256 b098f0add37331c9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 21:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6e38112f7bb68cb793c2f2913c4a85fb SHA-1: c48fc63f76351f622f1cc87e3f632a482118ed1c SHA-256: b098f0add37331c99fcee456a98f857fdc9064e6dfb25874c324759f43eee843
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous external links. One link points to known malicious redirector infrastructure, and many others are hosted on disposable domains, indicating a likely phishing or spam campaign designed to lead users to malicious content. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=d%2526d+square+grid+size In PDF document text
    • http://zuvomitapafi.22web.org/alpine_mrv-m500_installation.pdfIn PDF document text
    • http://smartcreditscore.info/63674288043z12ns.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/hb8ghig/vogozoli.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/aY3qjjj/7086733997.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/ENughx4/vureg.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/5a114.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/igegdgH/butudotudamune.pdfIn PDF document text
    • http://republvinb.fun/kumubijepunigiljr1vk.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/jISEl3Z/guxurulorona.pdfIn PDF document text
    • http://yesnutural.space/dixujin6zzta.pdfIn PDF document text
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/welisadulofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ff7fe2-d5ae-4848-8aff-3526408bc4c4/10053184465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29155a9b-75f7-4593-8d47-7c66eaa7c0dc/1994_honda_accord_parts_for_sale.pdfIn PDF document text
    • http://jusiwanemil.epizy.com/little_ducklings_nursery_ofsted_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7b36fa-2562-43d5-a1c0-6baae1f5b72f/82600931353.pdfIn PDF document text
    • http://nomulumipal.rf.gd/75855639864.pdfIn PDF document text
    • http://duzewinabo.epizy.com/3rd_grade_language_arts_worksheets.pdfIn PDF document text
    • http://pawubiba.epizy.com/the_devil_is_a_part_timer_light_novel_after_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19ea46f-8ecc-4fbe-8c7d-de547aa521eb/real_analysis_math_reddit.pdfIn PDF document text
    • http://lorazak.epizy.com/developer_android_studio_releases_platform_tools.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 4156 bytes
SHA-256: 3c306e0ec94285d13e87c04bb9d91e20e74eae243bb960c666b01ded030faf74
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 10532 bytes
SHA-256: aa682a69172907932bab2e611543a41aa114fb0148d04300c82373a4a28ea639

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