Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fefe7e7e54bb1dc…

MALICIOUS

PDF

82.2 KB Created: 2021-03-21 09:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 41b8a266784b28ce8a60e80bf15c3717 SHA-1: e93692e6c0d3d95ffc7331026ec6415671079c25 SHA-256: 8fefe7e7e54bb1dc4f85d0ef6f6d1dd8e8159ff3b8d8d01aeb4fdb083246ec4f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using disposable hosting for a large number of links, often associated with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=bully+dog+gt+tuner+diesel+review PDF link annotation
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/4d26ded848.pdfIn PDF document text
    • http://pavozuketogo.mygamesonline.org/bpmn_2._0_example.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/6042552.pdfIn PDF document text
    • http://risitolamaxil.22web.org/72810077972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fe53dfdd9311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_602018bd5672c.pdfIn PDF document text
    • https://jarupaxalimex.weebly.com/uploads/1/3/5/3/135324443/vafemutuvekuxufinuv.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/kujanape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_60370e788b6c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumepenitujox.atwebpages.com/what_are_the_different_kinds_of_words.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_f41be2d299c94aa299af960f96e17bde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/boxizodevupoxebexumebew.pdfIn PDF document text
    • http://tukozadagafewan.rf.gd/abcd2_score_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/will_there_be_a_season_3_for_big_little_lies.pdfIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_e46a3e480d014d62b53c633564591076.pdf?index=trueIn PDF document text
    • http://najorenowodume.epizy.com/87755572377.pdfIn PDF document text
    • http://wokolutomi.rf.gd/unir_dos_en_uno_gratis.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_03f5fe4815884d68af0c8524280f7f82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/bowflex_selecttech_560_manual.pdfIn PDF document text
    • http://losirerosusakaf.rf.gd/where_can_i_buy_one_touch_ultra_2_test_strips.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_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 5088 bytes
SHA-256: dcf7b8eb07267fb8eda8821ad998d3fc48d4e9b73990dfe35dcff5174d49b87d
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 10516 bytes
SHA-256: 6213de978e37756d73a4ddc951637381d8bae34dfee67b41906bb2b247299569

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