Malicious PDF — malware analysis report

Static analysis result for SHA-256 2783aaf82c2df8ba…

MALICIOUS

PDF

84.2 KB Created: 2021-03-13 22:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20957e8cf4fe4deef86f15d4ef89ee77 SHA-1: b548f3fbdb79bb2b7874517962f6c590aeb3c724 SHA-256: 2783aaf82c2df8ba837649fd9cedf7150723094e38f61243f55364a489c74216
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 numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The embedded URLs and the heuristic firings suggest a link farm or phishing lure, likely intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/strik?utm_term=hp+laserjet+printer+cp1525nw+manual PDF link annotation
    • http://xagimovuroj.22web.org/dawood_mentor_book.pdfIn PDF document text
    • http://losinglotterynumbers.com/munega5ye1.pdfIn PDF document text
    • http://copyrights-notices-helps.com/tirofebiluhbyas.pdfIn PDF document text
    • http://usejus.club/introduction_to_philosophy_notescnyj3.pdfIn PDF document text
    • http://mediaverifiedbadge.com/nunegapijinat8syi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_58bdd5fb544941b581ad58845495e741.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e2c918-d78a-4f3f-ac21-fce165a68dc7/17_day_diet_reviews_pros_and_cons.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_5191a6e64119441c80a725e302e6487d.pdf?index=trueIn PDF document text
    • http://vavilonogamet.epizy.com/roworezajewidedodamoxumun.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_0ae357d335924dc589fbbb2ae0c4038f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51f7834-0b98-44aa-836f-3be94c18fb96/delta_unisaw_table_saw_splitter.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_d14d3f4aa12c40098d4f1db365a17964.pdf?index=trueIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_39159f0c11894400a43277ee5c7c1f01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/adverbs_of_frequency_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/bernina_artista_180_user_manual.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_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 5516 bytes
SHA-256: 0607f313716c139033dd0f52d7278b2305ddcb5418760f8591c1bef28a5ad14a
font_01_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 11200 bytes
SHA-256: 339a2635a1236ceb09c81b9df6e01a6fb6ba9cc8c8df307f5d628da052cf8be4

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