Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80de820c03a22d6…

MALICIOUS

PDF

75.7 KB Created: 2021-01-08 08:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 735d49e073d423bc777a1519ce15729d SHA-1: dafbbc8df6222d112b14c9f201d63c69219af2cf SHA-256: a80de820c03a22d60a0222ceb7768dae99894af448df4bbbdfad6bceb595bad1
252 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicate that the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=church+musician+salary+guide
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/1ee2e38.pdf
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/a58d90d26be3.pdf
    • https://webegoxu.weebly.com/uploads/1/3/2/6/132682681/vaverebipiwavit.pdf
    • https://xikubafol.weebly.com/uploads/1/3/4/6/134607040/mamegituvuja.pdf
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/rekikes-wixepu.pdf
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/nonawe-vasukiwuxebaba-sodoriwizaripu-saxiwumem.pdf
    • https://tufojeju.weebly.com/uploads/1/3/0/7/130740258/zamokivevuwi.pdf
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/3148caa.pdf
    • https://cdn.sqhk.co/vifutetax/eWEhfia/jogubogomaxazawilewe.pdf
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5fcfb5bb56e11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bd41f786-a578-4167-af25-4ce7baadba2b/90977332178.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df04.bin
d0ffbb5da19f15553d108a1f8350839e1d13ed37e488735a6005c985b2bdc453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 5168 bytes
font_01_sfnt_off0000f063.bin
1b171bc3486d33d39621ed19ef7ca410dd0afd13613ccf395d76f4eb887ddf2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10360 bytes
font_02_sfnt_off000113c5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 4324 bytes

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