Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cb7fe1ed950403…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 16:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f08283d9a9fbb3d5c04ef0c14923636c SHA-1: 5a0a0fe8c24dc5c547113ede136069c8e56aec0c SHA-256: 28cb7fe1ed9504035cf1571647402c413600c31f8e3d3a158ca759fa6144f806
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=honda+gcv160+oil+in+air+filter PDF link annotation
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/3b2b279e7.pdfIn PDF document text
    • https://nofawukamo.weebly.com/uploads/1/3/5/3/135347109/bc40c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_60486fec0dd5e.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/piluxagopalamesani.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/4445779.pdfIn PDF document text
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/mipij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5fcbb29b29364.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/zuwetozifa.pdfIn PDF document text
    • https://pedekibitu.weebly.com/uploads/1/3/4/6/134669881/7d85cef14.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/J9Bxhfg/cute_casino_slots_free_vegas_slot_machine_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/hehJCgi/nenixegosofelopuni.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/woraz-bagewegax-konapupino.pdfIn PDF document text
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/gekof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fcf2ddc058f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475562/normal_5fcb1bea5403a.pdfIn PDF document text
    • https://tagaxaxe.weebly.com/uploads/1/3/5/3/135390661/6633782.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/5768ece0c357.pdfIn PDF document text
    • https://sezenoxesakibek.weebly.com/uploads/1/3/0/7/130740551/lavisokoregakox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc95261098e5.pdfIn PDF document text
    • https://xifanelisiwokof.weebly.com/uploads/1/3/0/8/130874433/nozejovotojaw-rafidavajonunen-futebifajava-gajexutelomul.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/letefidabo-xobexumuta-jabetamid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_a889e450dce04c20be9a6f3084758e69.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_96a961f443b6471a8654c1c31fd3f3eb.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_15c3fcc3bed140cea78d6ffb3bae99d3.pdf?index=trueIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_55aac8737d0b46839676fc1dc575d406.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5380 bytes
SHA-256: 84d89a24afcdce06369812dd8d592359e7bddf7551242fbc9a8b3de2889ce48d
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10408 bytes
SHA-256: 5ac34a556f38d4f8227ce3faeaeb1b80ada12760e05c052a77701c9cfdf3218b

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