Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c15eeb92c608736…

MALICIOUS

PDF

28.8 KB Created: 2020-04-03 17:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1dcbee00c3195395a4d5ec5682118ad SHA-1: 88ec77147af6bdcfcc4d9c9645b4105e4c05cc84 SHA-256: 5c15eeb92c6087369d1fa29770d6a6be4b6ec28c767433d1a679b0700f4af4ef
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier and contains a significant number of external links, many of which point to domains structured similarly to link farms. The primary purpose appears to be SEO manipulation or redirecting users to potentially harmful content through these numerous links. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://guadaluperegionalwellnesscenter.com/uploads/1/3/1/3/131383790/131383790.html#ark+onyc+taming
    • http://stmotorsales.com/uploads/1/3/0/7/130740320/kovapetifajuxaz.pdf
    • http://shymiahchanelextensions.com/uploads/1/3/0/9/130969920/3c6f4b187c1ce.pdf
    • http://financetipsformums.com/uploads/1/3/0/5/130545278/0ad8282aa60.pdf
    • http://islamexico.com/uploads/1/3/0/3/130312971/widug.pdf
    • http://eilishfoleyva.com/uploads/1/3/0/4/130435574/dasejez-wotetan-ladetewuvagi-kumalitag.pdf
    • http://moderndespot.com/uploads/1/3/0/6/130604599/2869245.pdf
    • http://conalmedi.net/uploads/1/3/1/0/131070753/bed75.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049e5.bin
220832bd6916b883bcdd1f4a061c7dca6b570e6c56e11fb0ce9d92282b92f97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E5 7424 bytes

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