Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef09087ad0925af9…

MALICIOUS

PDF

44.9 KB Created: 2020-03-16 16:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca4a6079b685eed5e28cf986dcf29aa3 SHA-1: ca646868fb05b8ae92fa617f968fa64ebbd5ae6d SHA-256: ef09087ad0925af9869c28e5204c774425181774183cc835aea17c18a605b39c
94 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious with high confidence. Static analysis revealed it contains a large number of external links, characteristic of a link farm. The document body, though partially corrupted, contains references to URLs that are also present in the list of extracted URLs. The primary function appears to be redirecting users to a multitude of other PDF files hosted across various domains.

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://seastar.websalve.com/uploads/1/3/0/2/130288552/130288552.html#sujeto+ejemplos+oraciones+subordinadas
    • http://maveriqs.co/uploads/1/3/0/8/130874289/gekaririmen.pdf
    • http://hostmaster.wacg.info/uploads/1/3/0/7/130776063/8393079.pdf
    • http://laurawanamakerdoulas.com/uploads/1/3/0/6/130620945/wazadavulew-ralumabax-mevav.pdf
    • http://cattcousins.com/uploads/1/3/0/2/130272511/muxozupoluw.pdf
    • http://www.realsignaturestyle.com/uploads/1/3/0/4/130483673/bopowolesajujer-vulil.pdf
    • http://bestejongerenreizen.com/uploads/1/3/0/2/130289623/vevefa.pdf
    • http://theouterlookinc.com/uploads/1/3/0/7/130775848/1788615.pdf
    • http://nadzorinwestorski-gliwice.pl/uploads/1/3/0/7/130775651/1143993.pdf
    • http://romaniatravelers.co.uk/uploads/1/3/0/7/130776712/4311798.pdf
    • http://agentsofnightfire.com/uploads/1/3/0/3/130313398/6177816.pdf
    • http://signalhill.com.au/uploads/1/3/0/3/130379415/4888632.pdf
    • http://www.bntenterprises.net/uploads/1/3/0/4/130483578/nudevedub-dunupebapedo.pdf
    • http://tuesdayconsulting.com/uploads/1/3/0/2/130272575/wilisarufunefoj.pdf
    • http://northerntundra.com/uploads/1/3/0/4/130476344/1d75b95e065.pdf
    • http://amcdistribution.ca/uploads/1/3/0/6/130604750/9370250.pdf
    • http://colo-ip16.mnemonix.com/uploads/1/3/0/6/130604112/raxus.pdf
    • http://evanschristianoutfitters.org/uploads/1/3/0/8/130814177/3df1b7da059.pdf
    • http://www.3dparadisepropertiesllc.com/uploads/1/3/0/8/130874523/zamudofuna.pdf
    • http://quality1staluminum.com/uploads/1/3/0/4/130488565/fukakifudovofor.pdf
    • http://www.pleasingyoubeauty.com/uploads/1/3/0/4/130476678/kojizaxege-nuxusaleroseni.pdf
    • http://www.testinggateway.solutions/uploads/1/3/0/7/130775247/2184205.pdf
    • http://bwhitaker.com/uploads/1/3/0/6/130620459/gimoxaj_xufab_radomanewediwib_tunelaluzomara.pdf
    • http://ournextarc.com/uploads/1/3/0/7/130740618/54b865e8a767.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007abc.bin
5d65dbb77f5c36d6e0048c2d36325302294d430f6fc2047b7c67968bdaa708ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABC 8564 bytes
font_01_sfnt_off00009a1a.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1A 2652 bytes

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