Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3db5747b75815f…

MALICIOUS

PDF

38.7 KB Created: 2020-05-20 03:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 124d302186d4939c5e8b69645a20ccac SHA-1: 2d38c953d332f14655e14fd80b623ce47574bb40 SHA-256: bd3db5747b75815f7aba4b9c11dfaedfe52a8adc81cf79094699bbb093d26d24
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gatewayriskadvisors.com/uploads/1/3/1/6/131636779/131636779.html#protein+structure+pogil+answer+key+a
    • http://lizraynor.com/uploads/1/3/0/8/130874180/demitofolagoxev_gikafafatusu.pdf
    • http://tsk-germania-muengersdorf.koeln/uploads/1/3/0/4/130478819/wivivasopi_gagemosimuwud_kizefedipa_diderizibame.pdf
    • http://wkhsnewstv3.com/uploads/1/3/0/3/130323896/vixil.pdf
    • http://ozarkfamilyoperacompany.com/uploads/1/3/0/8/130873830/bfff0ca76a.pdf
    • http://us-maker.com/uploads/1/3/0/8/130874475/folobupo.pdf
    • http://wetbradio.com/uploads/1/3/1/3/131383953/813250.pdf
    • http://ifoughtthelawb.org/uploads/1/3/0/8/130874148/bogama-nasilamufemer-xuzerinoroz-dibonebivuleto.pdf
    • http://waggy-tails.org/uploads/1/3/0/8/130873839/40de001f4.pdf
    • http://alliedwealthfinancial.com/uploads/1/3/0/5/130551132/70d9de54b6a1200.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_off000068c4.bin
c50f4257bc154be62293d12e31d5038e90297bf050fc605bbb5d5ccf3c7f27c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C4 11580 bytes

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