Malicious PDF — malware analysis report

Static analysis result for SHA-256 681074bf5d527dcd…

MALICIOUS

PDF

43.3 KB Created: 2020-04-03 09:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 737d254e453f220941fd7b1a4b6b95f4 SHA-1: 21ba643e29df1923944daff428fd004c74e81370 SHA-256: 681074bf5d527dcd2159ffdd793c93c17593b8389bedc3a95f739ac015542a98
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a potential link farm or SEO manipulation scheme. One high-risk heuristic identified a PDF link to an algorithmically-generated URL, suggesting a malicious intent to distribute further content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://robwegman.com/uploads/1/3/0/2/130287279/130287279.html#best+umbilical+hernia+belt+for+babies
    • http://bgxcouriers.com/uploads/1/3/0/5/130540009/tokatuse_musuzut_jokiwu.pdf
    • http://innovativetherapysolutions.com/uploads/1/3/1/1/131163620/tibasu-tibatekedu-gawex.pdf
    • http://shopjohnandtaylor.com/uploads/1/3/0/6/130621219/fenimopesizor-lejijepox-taropexuniwiki-segag.pdf
    • http://liacare.org/uploads/1/3/1/4/131409884/gexexiwabafuba.pdf
    • http://theassistantshub.com/uploads/1/3/0/5/130539763/6c880abe.pdf
    • http://turnipseed.ca/uploads/1/3/0/6/130639762/7803897.pdf
    • http://homedesignandconstruction.net/uploads/1/3/0/6/130621950/bedunebapovu.pdf
    • http://teff-rific.com/uploads/1/3/0/7/130738963/692059.pdf
    • http://gorillamixtapes.com/uploads/1/3/0/5/130589033/993255.pdf
    • http://viking-roulette-system.com/uploads/1/3/0/6/130621458/folikovebekalaz.pdf
    • http://myhempisbomb.com/uploads/1/3/0/7/130776619/xaterisaj-sipekupawozul-mixez-vomejono.pdf
    • http://rowdyweed.com/uploads/1/3/0/6/130620868/vevefilebe_zomifekana_vurukuv_wewesexenikide.pdf
    • http://shopnmybag.com/uploads/1/3/0/7/130775248/6b2a6b9aa3ab.pdf
    • http://jeannesternerphotography.com/uploads/1/3/1/1/131164545/91b3141.pdf
    • http://duchesseantoinettecommunicates.com/uploads/1/3/0/7/130739121/dezomudusapafu.pdf
    • http://yoursupplier.ca/uploads/1/3/0/7/130775889/togaworekorul-todagelo-vaminex-wajasix.pdf
    • http://s-p-q.org/uploads/1/3/0/5/130545957/2336383.pdf
    • http://marysvillestorage.net/uploads/1/3/0/4/130483426/setovuvedajika.pdf
    • http://pureandsimpletruthforyouth.org/uploads/1/3/0/8/130813899/3832392.pdf
    • http://lisacmathieson.com/uploads/1/3/0/3/130313702/wepedagigokek.pdf
    • http://mrcontractingservices.com/uploads/1/3/1/0/131070572/xeradisilosapo-xepuvesi-lowexasiguwato.pdf
    • http://gr8ter.org/uploads/1/3/0/4/130489418/eeb8720b4.pdf
    • http://abqcraft.com/uploads/1/3/0/5/130588478/8974699.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_off0000834b.bin
4be4c67c45cf04dee7d18c2956cdeb945205c2cbfc0a23aed7a586f6fb75c90f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834B 7116 bytes

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