Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de3b66f039ae1ad…

MALICIOUS

PDF

73.1 KB Created: 2021-06-11 16:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9571effff30d220391b4691128ed7d9f SHA-1: 8b15b7af622ed70afde513a018cf36de321c569f SHA-256: 1de3b66f039ae1ad51d58277961b03ec5132732bb390ee0fa81be2dd175be9bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme for malicious purposes. The primary lure appears to be 'How to draw a small gun', which is likely a deceptive title to entice clicks to malicious or phishing sites. ClamAV and ML classifiers strongly indicate malicious content, consistent with a phishing or scam campaign.

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://crysiq.ru/pbw?utm_term=how+to+draw+a+small+gun PDF link annotation
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/zesit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5fc866a015ea3.pdfIn PDF document text
    • https://xasewaverafi.weebly.com/uploads/1/3/4/8/134868265/8439493.pdfIn PDF document text
    • https://jedozemuko.weebly.com/uploads/1/3/4/5/134596711/4120202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_600bc629dab71.pdfIn PDF document text
    • https://fupemotajupatis.weebly.com/uploads/1/3/4/7/134718556/marozonitab_jejelubumijezof_katolonazer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_605e16c002e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_60bd72e045b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5fe7870a6ece9.pdfIn PDF document text
    • https://vesodebeso.weebly.com/uploads/1/3/4/3/134314426/c39f5d.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/radoxawon.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/171f28f5-d523-492b-93bc-90b192b8d748/physics_textbook_grade_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485ffa44-7149-4770-aa9d-eac519dcbdc7/how_to_learn_korean_quickly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba9eed6-7717-480d-9fbd-9bd12d90f711/how_much_do_residential_irrigation_systems_cost.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/w/file/fetch/144730449/does_cricut_expression_2_have_bluetooth.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/w/file/fetch/144629136/ladilifetidufirise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91af83f9-a10a-4f44-8c3f-3db4fa2a13f6/vanerifudugabuxaripegulo.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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 5200 bytes
SHA-256: 2b6023f09b395a37751acb30c1d7409e0669e3f7eea3c2ab23d97c3261730269
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 11268 bytes
SHA-256: 23fab960ebedb4f57aa423dc9c5a2a0862d3a7050a285df705f23e1a7beb7f81

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