Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dd27bfd4b2522d…

MALICIOUS

PDF

81.3 KB Created: 2021-04-24 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bd6c1c1d053367133de10acf45b0fc31 SHA-1: 291567ed10ff3696b8e3610229ec9e4b4659920a SHA-256: a5dd27bfd4b2522de3d65a8f74ae00a801c221d140dfcab82bf69401951f8d2e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The presence of a URL with 'utm_term=power+pressure+cooker+xl+repair+parts' suggests a potential lure for users searching for specific product information. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://soxebez.ru/strik?utm_term=power+pressure+cooker+xl+repair+parts PDF link annotation
    • http://dekiweragaf.mywebcommunity.org/pediatric_cervical_lymphadenopathy.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/91f9b568c204e3e.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/what_a_beautiful_name_hillsong_worship_chords.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/gexaverivinifarel.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/tusogixoworonovanufi.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/b30b7b0.pdfIn PDF document text
    • https://dademogu.weebly.com/uploads/1/3/4/5/134591834/1008554.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/d30e3efbb7.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/stihl_battery_hedge_trimmer_reviews.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/2217827.pdfIn PDF document text
    • http://vufilulojusabid.iblogger.org/video_sales_letter_powerpoint_template.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/gosulupesulo-fewijijonem.pdfIn PDF document text
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/pazosiwejum_falasoboladodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazozoludurisat.epizy.com/34358621018.pdfIn PDF document text
    • http://kezakixekinefa.rf.gd/zitobexo.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_af071fa0c83c4ab2b3d5bcc649de5c13.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_9561391902224eea93ef9d2dabff0d93.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_f873223c4ae8476482306f5f3d24eae5.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_7bd76f9b414d40fc9c56bef869f090f2.pdf?index=trueIn PDF document text
    • http://fokerek.epizy.com/designing_a_lesson_plan_template.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_37bd795617d84198adffc88a8eea5e3b.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_08c4180325dd45a1af89d2bf93991d88.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_edd966d813c74aa6b5bd7656ac332428.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_a674d44986444198abf0efb6c64474e7.pdf?index=trueIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_a8170c0b150b42679ea6826c00afaeeb.pdf?index=trueIn PDF document text
    • http://xokolupagemi.rf.gd/treatment_of_hearing_impairment.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_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 5152 bytes
SHA-256: 6379150b15c6f4f2c66430d72193a1265f6ca76e026ca2ce34fbfa0036b7df31
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 11484 bytes
SHA-256: 5f21701440dabad711e6c482532215f59c80464f1a0a2f254985b05c76055cde