Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f671584e078fb0b…

MALICIOUS

PDF

82.8 KB Created: 2021-01-24 13:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa3d4d2515d174da1982c3e5538ab19 SHA-1: ecef6c61bc237d995eb6edb04cf1020dd2b5e2ea SHA-256: 2f671584e078fb0b7d5a5912afc8eb678b60c686263141ce60a57765d480a3c5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/123?utm_term=2002+mustang+gt+specs
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/1563049.pdf
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/tusepotewijam.pdf
    • http://balonedud.iblogger.org/xoziso.pdf
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5fd5f3c48e5fa.pdf
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/varape-zosezigal-pabapawawiwupeg-zokogesix.pdf
    • https://nopuwujipa.weebly.com/uploads/1/3/5/4/135400678/2657262.pdf
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5feef25215147.pdf
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/1418793.pdf
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/mikelijus.pdf
    • http://dehydratedoriginalgoodness.com/71429417015nc8hu.pdf
    • http://pearhaidhr.fun/kinesurozug1xhx.pdf
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff3b007385e5.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kigizeme.epizy.com/jowul.pdf
    • http://bewebumaxof.epizy.com/invoker_dota_2_guide_skill.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f1b5.bin
6534345ffee63687b4dd79312bf031e42f8e10ba8c0cc4054f9efae83970a812		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1B5 12548 bytes
font_00_sfnt_off0000dfc3.bin
0214a995fdaad63bb3b963f0727cf4947018a78b99a1eeda1fe0bb0ecf4960ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 5304 bytes
font_02_sfnt_off000114d2.bin
f41091ad7e4bb6197e3fc1095ef01f239c0a174477855e7bf17553f797167413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 12408 bytes

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