Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ba138a62df10c…

MALICIOUS

PDF

69.7 KB Created: 2020-12-23 01:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 960a54954eca64da4eaa3be73d332f2e SHA-1: 941a7fb628a3bd61e6a928ac6e0099a66eeee83a SHA-256: 869ba138a62df10cc02add479ecb195ed9f333deeddbb1a880e3d71f4ea5b9b1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign. No scripts were extracted, but the extensive link farm indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=lineage+2+high+five+adventurer+guide In PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/decb00d9d7.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/0eb6f63677fefc.pdfIn PDF document text
    • https://kijenelix.weebly.com/uploads/1/3/4/6/134612576/f5bd4088.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/dafip.pdfIn PDF document text
    • https://zedimidobigeno.weebly.com/uploads/1/3/4/7/134721933/c5fb0c203e9fbf8.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/sudidovonomuje-xatukini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/coefficient_of_kinetic_friction_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5fc2c1-2df0-477e-9e55-7f7af3a794ea/zobomubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5163861e-fc3a-4551-9365-4fb799612fe3/how_proust_can_change_your_life.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/background_black_smoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33d85df-9692-4b32-8c4f-ec3143fe9a04/nq_mobile_security_7.2_premium_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2a4ad7fbea164c2cd181/t/5fde12247514fb3b763a4bdb/1608389157876/43785055293.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/maxamesirafobasagikuv.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/orc_assault_unblocked.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_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 5092 bytes
SHA-256: 16a50426c36defbbd77366fb7324ac51116394131e89f23162f4972010cb7006
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 11224 bytes
SHA-256: 0530c1d33afd2c14b87f92fc7c1955b9902c08e0ea6382dcc7c0376b111876f0

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