Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa684de760f32b3…

MALICIOUS

PDF

34.8 KB Created: 2020-04-02 11:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3320e3bebf519ef200c56cc46e6b7b88 SHA-1: 20cae41c9aca847696a8fb507a33e7c16cb7ff03 SHA-256: 1aa684de760f32b3b13c37a55a3fe23748fcf975340bb82e6f9adbfe9554d655
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which follow a similar numeric or slug-based pattern, indicating a link farm or SEO spam tactic. The document body itself is heavily obfuscated but contains references to the URLs. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://netherhaughfarm.com/uploads/1/3/1/0/131070858/131070858.html#imagen+de+personas+saludando+para+colorear
    • http://infomaxima.com/uploads/1/3/0/6/130603982/5876019.pdf
    • http://mail.jansenexpertwitnessing.com/uploads/1/3/0/5/130589114/pexuzo-josol.pdf
    • http://choctawhatcheeriverretrievers.com/uploads/1/3/0/2/130289198/5a54032fdb15c4.pdf
    • http://mercyinguyana.org/uploads/1/3/0/6/130639805/25efc60897845.pdf
    • http://kompletekleaningsolutions.net/uploads/1/3/0/4/130435571/60c43.pdf
    • http://midamericacongregationallife.org/uploads/1/3/0/9/130969942/6b83fc3fb4.pdf
    • http://centropsispostamenti.com/uploads/1/3/0/5/130550813/e1b6bde0674f0d.pdf
    • http://swkfrenchbulldogs.com/uploads/1/3/0/7/130739060/383feeb.pdf
    • http://completeprovidence.com/uploads/1/3/1/3/131398348/nolaguleguku.pdf
    • http://www.discountduniya.com/uploads/1/3/0/2/130289573/vidikuzube-pimajevikekor-tipejesulinob-kewemutemimawe.pdf
    • http://rehobothgirl.com/uploads/1/3/0/2/130291803/f295d8cd18f662.pdf
    • http://ambitie.es/uploads/1/3/0/4/130483205/xixitevunozuz-renagusagi-mukumufusavifi.pdf
    • http://thecherryontopbakery.com/uploads/1/3/0/2/130289565/3cad35776dc7.pdf
    • http://lessons4life101.com/uploads/1/3/1/3/131380295/nekapetaguxesozabeke.pdf
    • http://acquisitionone.ca/uploads/1/3/0/6/130605186/7564559.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_off00006343.bin
2f4d55bc090e8f30881f1c18edf57a4ea402db093c7e00a0dbe47beb55d4393a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 6508 bytes

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