Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5a7c2ca8331430…

MALICIOUS

PDF

72.2 KB Created: 2021-04-08 04:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c2c5989e3250676b9fdf3385a481a6d SHA-1: a61a8902124f5dca8d232a61979a8b38f784a869 SHA-256: 9a5a7c2ca83314301af2c2deeddf9e17abeb88266fd714aa233c155311a887e0
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 designed to direct users to potentially malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it with high confidence. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=calculus+maximus+worksheet+4.+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366987/normal_60041706d05d3.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/9788807.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/dejufetapopusas.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/zujirotoxelud-merapez-tufuxu.pdfIn PDF document text
    • https://xolipesu.weebly.com/uploads/1/3/4/6/134672505/wakenududewikife.pdfIn PDF document text
    • https://nasejanebuxilas.weebly.com/uploads/1/3/1/8/131856105/3789641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fc8b39c6b965.pdfIn PDF document text
    • https://pameduvexeligim.weebly.com/uploads/1/3/4/5/134579292/591eff5943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fdcb1b0edced.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/wadijobinetezuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodemomawul.epizy.com/ballet_barre_exercises.pdfIn PDF document text
    • http://mewivoxirogowe.rf.gd/6643687387.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/62727058254.pdfIn PDF document text
    • http://jegapedobip.epizy.com/consider_yourself_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c500d6-1399-4f79-a7bb-5d81fbccb11b/39501764955.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/cetoconazol_xampu_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a519c7-784d-43c1-b140-f1e27b144889/kadujugejejikirekete.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/gugimokov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b67783-858d-4794-8286-a0aeb39f47c1/which_is_better_traeger_or_camp_chef.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 5340 bytes
SHA-256: 44e05a2a5a42b53f4e8afd34a711af73fcecbb62e6393f957cd158b0b8ac732c
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10308 bytes
SHA-256: 35d34a1f00b5e25b29b26450b930714c08f5691e9653f69c9b1998e9bff3d940

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