Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29ecc891609a7ec…

MALICIOUS

PDF

71.2 KB Created: 2021-04-26 08:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9957600d78271730ce566f5ae15a2ed2 SHA-1: de3cfa398426069d05925b5408258de065a3e8ba SHA-256: f29ecc891609a7ecdcf1d8dcc29b78e33d5b7daa7f4647e8a6e3a5870494b5d5
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, one of which is flagged as benign but others are suspicious and likely lead to phishing or malware. The document body is heavily obfuscated, but the presence of PDF_URI and EMBEDDED_URL heuristics suggests an attempt to redirect the user to external resources. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dgs-interparts.be/sites/default/files/57515461030.pdf
    • https://www.uts.cw/sites/default/files/webform/bofuwidesuxugebogaxa.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/tasuwagorefovufozibojer.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/42283273604.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/17232120942.pdf
    • https://www.uts.cw/sites/default/files/webform/96040264728.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/32056102714.pdf
    • https://ambrose.edu/sites/default/files/webform/48232920683.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/43600748611.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/ligexupasofobepis.pdf
    • https://natsihwa.org.au/sites/default/files/webform/46250275999.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/1232685222.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/1289321409.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/zomufajiwadusepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=12+steps+program+aa
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db00.bin
25b81a66b796a687a22ce7c349dcd7db20a49dd30ce3ab0992225ae83848381a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 5196 bytes
font_01_sfnt_off0000ec9a.bin
712bdda8a9100da84fe927ee89c7dda7f1a5ff01287cd6871803def03c3a1f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10544 bytes

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