Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a9638d54e3fa36…

MALICIOUS

PDF

84.2 KB Created: 2021-03-14 22:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b39bf823f36a8d3cf71aa59048bbce0d SHA-1: 511bb5cf0a0dcb4f99cf3dd1fe5aa4f3fcb4d1cb SHA-256: 93a9638d54e3fa36840e0b33c093bd57d1786e92ee8b6b69c66c9455cc191aa2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/wix?keyword=words+with+two+meanings PDF link annotation
    • http://cartest.pro/pilopopusexabenetabowerigvjhyj.pdfIn PDF document text
    • http://flowerport.market/pathfinder_healer_oracle_guiden784y.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/1770199.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/8fb70cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_6045d629dec09.pdfIn PDF document text
    • https://fupozivu.weebly.com/uploads/1/3/5/3/135316658/5046754.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/50aac6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_602f99c7d8252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_601802897cb2e.pdfIn PDF document text
    • http://pycnidwzxc.info/edenpure_heater_blowing_cold_airaw2i5.pdfIn PDF document text
    • http://erethiztzj.space/428125110179u591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492586/normal_60399a34858f5.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/govutapajepig.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/puxuvowubazerefo.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/283895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_600b1202acdae.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/ledutujewuzubut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_60339d1e5e193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_602d39f9d9364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367961/normal_5fe5b6b7b6a90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_9184a409a9b84375b05439499fdd074b.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_b9c37fddc4fd4eed98c3f25e28f75276.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_835d615ece824b64a0fab3ef91f264a7.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_f9996982b17c4e2c8304f0855b83d690.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_025034c3557741988876410d69daf46a.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_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 5312 bytes
SHA-256: a0567c9455d5d00f16778b5cf838625935d3dd751ce10be475c1b988124c8c3f
font_01_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 10336 bytes
SHA-256: f775bd62d7e0b76f64a12ce43b15766ef50fcc14c58a01552d8f865e8308e577