Malicious PDF — malware analysis report

Static analysis result for SHA-256 c527f503887f173c…

MALICIOUS

PDF

86.1 KB Created: 2021-03-16 05:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f7ad8481d5677059dba2f92abba0767 SHA-1: cd79e8b67a6400e04dd8ff5d6d012ad213118e08 SHA-256: c527f503887f173c8b6fa8e3d5a005be6fd7271369057994f9ed0d0a9dcaf933
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, characteristic of an SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious websites. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/wix?keyword=mastering+qlikview+stephen+redmond+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fd384cd924d5.pdfIn PDF document text
    • http://milanbeach.fun/star_wars_thrawn_series_books6nfm0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_6027e1f080886.pdfIn PDF document text
    • http://matteset-spon.space/48570277935o9epx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_6036b3aad5473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_6016813d69458.pdfIn PDF document text
    • http://ehaberdevlet.com/voxupukumegibc1v9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_5fc6d080b7cf7.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/3817522.pdfIn PDF document text
    • https://xazupuve.weebly.com/uploads/1/3/4/8/134863790/muzokumazidi-wibixi-durawogaloxon-jenedik.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/nafoxawunuwivukipeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_60011395b060d.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/1762349.pdfIn PDF document text
    • http://laulu-go.ru/917851673823zv5k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_60068443abe65.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/b4121888d337bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_b021299f91de4ad9a110068880a12343.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_20ba0d68d6594b6e9d32528f96af4063.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/delamu.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/25953126762.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/firefly_2018_poster.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_c3766950827a40e3ad3be02adb476ee4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/fasuriwigajubekawukos.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_d4c68134b1fa41c1bc404e61799349a6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 5592 bytes
SHA-256: 914ba8e414a259f404106cb55649a78ef15feb63474d163df66270493cfd9730
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 11864 bytes
SHA-256: 5b682ffa14c2baf49c5d93e84ddced87a56dc1ad28147eebfb9f75cee17902ef
font_02_sfnt_off00013ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71