Malicious PDF — malware analysis report

Static analysis result for SHA-256 829475100301a644…

MALICIOUS

PDF

79.9 KB Created: 2021-05-20 01:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe807d873d19eb411f171a0ccc3384a7 SHA-1: 222685015104685edcc10d1daec569682cc75f19 SHA-256: 829475100301a644f78ba31b3637f908632733293a28d28defd3355406eb6f3c
156 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. The heuristic firings point to a PDF link farm containing numerous external URLs, with one primary malicious URL identified. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=how+to+ask+god+to+reveal+things+to+you
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/6299901.pdf
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/rixef_xajanuvotodi.pdf
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/pobezolokosijod-degimuniper-wuturesago.pdf
    • https://cdn-cms.f-static.net/uploads/4452372/normal_6035d4a4a1021.pdf
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/508ed5b139acf32.pdf
    • https://static.s123-cdn-static.com/uploads/4452374/normal_5fe2f57aaa2d5.pdf
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/9157074.pdf
    • https://cdn-cms.f-static.net/uploads/4368956/normal_6063135e1933a.pdf
    • https://busegozujukot.weebly.com/uploads/1/3/0/8/130874370/1950329.pdf
    • https://cdn-cms.f-static.net/uploads/4487187/normal_602632ea0d89c.pdf
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/defulip_rulava_sefirejiba_wamok.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_604e47c3d35c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e75f0fe3-811c-43e8-8810-c854ec287d52/tivimowasuweradet.pdf
    • https://uploads.strikinglycdn.com/files/125bea9b-bb7d-4ebc-a626-088eff706409/kazidodegodid.pdf
    • https://uploads.strikinglycdn.com/files/c7f5fb76-4b86-4116-9323-149805e1b14c/wafugojevadevumozez.pdf
    • https://uploads.strikinglycdn.com/files/fc92e1a5-7869-47b7-bcba-cd02078c617b/architecture_form_space_and_order_book_download.pdf
    • https://uploads.strikinglycdn.com/files/6bdfd02e-c75e-48d9-851f-4e3bd11a57ae/98630903765.pdf
    • https://uploads.strikinglycdn.com/files/a9e1dbb8-3c07-4611-b9b9-bb9fd172f167/vulibikubotolububeteje.pdf
    • https://uploads.strikinglycdn.com/files/322d9203-2f9e-449a-af4f-4e2ce2062758/49825872704.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_off0000ed33.bin
7ac2e34de3fbda4c4a94266c3fe352080d17b7a70c3897656a799bd1945bf3df
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5248 bytes
font_01_sfnt_off0000ff14.bin
7f12d6635cf8c8c28b9d191c3a38f55c4ddd4d780002a84e98b1f0c27429d65e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 10828 bytes
font_02_sfnt_off00012426.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 4324 bytes