Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b5b4e6fa6c9f98…

MALICIOUS

PDF

69.8 KB Created: 2021-04-09 02:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1a17662a30a8b1d13f4c57a72c31983a SHA-1: 2711cbe557637bd26aede2cab27358954431c8e4 SHA-256: 49b5b4e6fa6c9f98d7703ada0fd7e2507a8bd0e540e3bac7f70227a40419a5f4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the classification as a link farm suggest the document's primary purpose is to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=what%2527s+data+science+all+about PDF link annotation
    • http://you-bestshop.xyz/method_of_undetermined_coefficientspwa9p.pdfIn PDF document text
    • http://shtangye.xyz/islands_for_sale_cheap_2019p1w5t.pdfIn PDF document text
    • http://shoop-fl.ru/449161755192p81z.pdfIn PDF document text
    • http://shoop-fg.ru/first_aid_booklet_ontariofbzg4.pdfIn PDF document text
    • http://mynasert.online/why_my_lg_washing_machine_wont_drain4pnfu.pdfIn PDF document text
    • http://localdesign.me/159340617398gwyh.pdfIn PDF document text
    • http://serviceforyou.site/263342482558lh32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_99b0d5f5e9a14768a95f9bce76747eb5.pdf?index=trueIn PDF document text
    • http://pasobopupolom.rf.gd/44445961867.pdfIn PDF document text
    • http://nekegax.epizy.com/92146311936.pdfIn PDF document text
    • http://dogazuzi.epizy.com/89519624227.pdfIn PDF document text
    • http://fobapisarut.epizy.com/sql_format_timestamp_as_date.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_d6e5098ec3d74d0caba7de21ae7517c9.pdf?index=trueIn PDF document text
    • http://wiwekire.epizy.com/gipimumabesavumozusok.pdfIn PDF document text
    • http://toresefitixebit.rf.gd/nudoxedegi.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_e0d611098a9f4660b910beb7210d72c4.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_391694d234eb419483e4966e9f317156.pdf?index=trueIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_91e57447b1544230a7045504deaa77c9.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 5120 bytes
SHA-256: bc704e92fb0b2838c00adb3988b553d438bef43473f1ff20f23486e023f6dbf3
font_01_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10372 bytes
SHA-256: 3f207ac921e2effa6ce797f001d38b5dc5b151bfb683c359c0b5c5383e9dda79

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