Malicious PDF — malware analysis report

Static analysis result for SHA-256 7561d0402e676953…

MALICIOUS

PDF

71.4 KB Created: 2021-02-06 07:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 91703f2fad621728d45d33c639c5fe19 SHA-1: 1fe215117189e80fc9f99e60fb20edbf31f5cd88 SHA-256: 7561d0402e6769534cfd8c0a3f90e4375cd1c005338e5adf6e8f5f57c94b26a5
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. It contains numerous external links, including one to 'baarspo.ru', suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/wb?keyword=diagnosing%20dementia%20nice%20guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5ff4f0e8dd6be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fdbe1486e6e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fff6ee4ae08f.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/dgficx9/color_switch_birds.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/4f4d5e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_600c0e2dd0936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe6e30d04866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393925/normal_5fff5517ce376.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/pjgu1Em/tabedorofudig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_6008351bc08d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fcedc8d32872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5feaf1ad313e0.pdfIn PDF document text
    • http://nubuweso.iblogger.org/48182657563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanenuxaxegozez.rf.gd/mipro_act-_32h_manual.pdfIn PDF document text
    • http://nagajawonusagu.epizy.com/xizojadowaketowoj.pdfIn PDF document text
    • http://bixuxopot.epizy.com/bojenonosoxavaledesone.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 5160 bytes
SHA-256: 2922e00a4914c347db8fbe8fb80226c1deff6151c990f7d0a81aa3142c38ff79
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10200 bytes
SHA-256: db462f17d84ea3010568b82e8ad79bb170def1ea72e61390e03053813dc42b78

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