Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14d73fa6d97817e…

MALICIOUS

PDF

87.4 KB Created: 2021-02-28 05:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 251bc2fcf8a928a651e6239795a35b3c SHA-1: 21461db233052d1eb899fdd571c8a4d75a1090c1 SHA-256: f14d73fa6d97817ec59a401bccbc26dc30aebb999f26908e3e25c31af66588e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to be related to a 'Montgomery ward tiller parts manual', likely a lure to attract users to click on the embedded malicious URLs. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jumiwimov.ru/award?keyword=montgomery+ward+tiller+parts+manual PDF link annotation
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/9f3f667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404750/normal_5fc74b4aebd09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fe9fe40eaaa1.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/cgljihh/xekunopugetuzimalinevuja.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/linuxoxakov_nolujuxesomiz.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/dtjcRgj/griswold_cast_iron_pans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_600c61b7e543f.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/acde16d7e51.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/5d22aee6595.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/8845397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_60149d9325fb7.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/1Bf1je4/guinea_pigs_for_sale_amazon.pdfIn PDF document text
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/d335efc965.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/K3ghieN/70743958114.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/waxegatulo/48244383112.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/incident_report_sample_letter_for_cash_shortage.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_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 5480 bytes
SHA-256: 516772f964333319e2751330f76401463eda24756d36ea73c5f67d079a8b3804
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10660 bytes
SHA-256: 58c36fadba06cdc131271a317f7582f65c16fe2f05cee0b00f05cc3f4d516625

Open this report in the interactive analyzer, or submit your own file for analysis.