Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c126c2a7dd5d4d…

MALICIOUS

PDF

32.5 KB Created: 2020-05-18 12:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a964ff37ada83f9a012542021c8104 SHA-1: 95e3b1a76fdbd472aeda9eb7ac6408ae65eff453 SHA-256: e8c126c2a7dd5d4d15be670eec163214cf35662571206ae7169e9fee271e0ebe
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains several of these URLs. This suggests the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gbonomo.com/uploads/1/3/1/4/131407492/131407492.html#geek+expansion+pack+cards+against+humanity
    • http://brasstackspersonalstyling.com/uploads/1/3/1/3/131383544/kilezam.pdf
    • http://helpinghandscleaningservice.org/uploads/1/3/0/7/130775936/0e026.pdf
    • http://shanesmithphd.com/uploads/1/3/0/5/130543600/632413c1595e1.pdf
    • http://francescdeverntallat.cat/uploads/1/3/0/4/130483288/13cb95.pdf
    • http://2findyourhomevps.net/uploads/1/3/0/6/130620924/koximetakufewan.pdf
    • http://youthtensils.com/uploads/1/3/0/5/130540493/bakebexavixu_julaxopupilesa_bodujaburiwata.pdf
    • http://szambabetonowe-poznan.pl/uploads/1/3/1/3/131398066/wutaj-pomugeduruw.pdf
    • http://bsd45.org/uploads/1/3/0/2/130289466/returetimam_wowakar_pixulovolos.pdf
    • http://djtommyd.com/uploads/1/3/0/7/130739539/fbd58cc8b6.pdf
    • http://itscaketime.org/uploads/1/3/0/2/130287279/5fa2122dd10.pdf
    • http://bigskyboost.com/uploads/1/3/0/8/130814575/2832430.pdf
    • http://penelopewalkerwriter.com/uploads/1/3/0/9/130970008/866684542ca.pdf
    • http://espaod.com/uploads/1/3/0/6/130622009/d7b13b12f.pdf
    • http://colorfulkisser.com/uploads/1/3/0/8/130814960/teboravab-baroxawokaxulin.pdf
    • http://mydne.com/uploads/1/3/1/1/131163620/gujadularasujiduku.pdf
    • http://danielmavalyantsmusic.com/uploads/1/3/1/1/131164447/3e5744e.pdf
    • http://evalmar.com/uploads/1/3/1/8/131857383/8ada1a211f.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_off000050b6.bin
2df76f8fcd154638ac843cffceb3f3633742ed51da5d57c98502c69b504f2a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B6 10488 bytes

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