Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd16ee3ddb3b31b…

MALICIOUS

PDF

36.6 KB Created: 2020-04-12 06:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0864ddb711866f836f247672f233473e SHA-1: 36e3d4e4acdeb0cf5dd3742c09ee3993d92e627d SHA-256: 3dd16ee3ddb3b31b4c4edb22dabe2b31a6f800470543fc4dcbbc194daeaf75a9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm. The document body text, though partially corrupted, suggests a lure related to 'biology textbooks'. The primary attack pattern involves redirecting users to these external sites, which are likely hosting malicious content or phishing pages. 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://mynaturalhairspa.com/uploads/1/3/0/9/130969045/130969045.html#libros+de+biolog%C3%ADa+para+bachillerato+pdf
    • http://muscarii.com/uploads/1/3/0/4/130435596/bivanobovabiz.pdf
    • http://skyvvord.com/uploads/1/3/0/5/130550955/d00cdde9.pdf
    • http://jdgroupadmin.com/uploads/1/3/0/6/130605258/lujudexiwinosorure.pdf
    • http://lawntrapreneur.com/uploads/1/3/0/7/130774965/tinilad.pdf
    • http://firstclasspens.com/uploads/1/3/0/3/130313145/ginapovu_tuvum.pdf
    • http://chrisandrandi.com/uploads/1/3/0/7/130776266/pisubulevuzizij_kemenizezilifel.pdf
    • http://bperfectgels.org/uploads/1/3/0/7/130738512/ruxerunilepanubabo.pdf
    • http://abccojo.net/uploads/1/3/0/4/130489123/ac2eef73e30267.pdf
    • http://bicomsydney.com/uploads/1/3/0/5/130538939/5434965.pdf
    • http://homefrontbuildershouston.com/uploads/1/3/1/0/131070294/8a23ce61edda.pdf
    • http://austinbelow.com/uploads/1/3/1/4/131413905/dufuze.pdf
    • http://djinajones.com/uploads/1/3/1/0/131070298/texonuzawulevi.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_off0000654d.bin
78c08a798516d7be950fed64cd65770d5fc5d47484ad57ce05f0ec06083f27e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654D 8340 bytes

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