Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ab88ff1edd54c0…

MALICIOUS

PDF

41.4 KB Created: 2020-03-23 14:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5dee2cbf0e7194fe7cfa135a523f3214 SHA-1: 7c4f90dd497b731d2fd3c8e8c4109b02435b8720 SHA-256: 62ab88ff1edd54c0be593e3e29f2a33b81bcb3cbd2bdfcb06ab5a3e3ab7d0792
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. These links likely serve to direct users to malicious websites or to manipulate search engine rankings, a common tactic for SEO spam or phishing campaigns. 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://avidaenglish.com/uploads/1/3/1/0/131070866/131070866.html#trioxido+de+azufre+fertilizante
    • http://bowman-landscaping.com/uploads/1/3/0/5/130589249/zuvupolenosobe.pdf
    • http://callanjames.co.nz/uploads/1/3/0/2/130274017/nuniwetarudarum.pdf
    • http://ru.investoigus.ee/uploads/1/3/1/0/131070529/1242941.pdf
    • http://www.lamezbeauty.com/uploads/1/3/0/5/130590420/7242695.pdf
    • http://reneseptic.com/uploads/1/3/0/6/130620971/4047100.pdf
    • http://cpanel.theequineapproach.com/uploads/1/3/0/8/130814633/dizezib.pdf
    • http://shrewsburycondo.com/uploads/1/3/0/4/130488983/2452710.pdf
    • http://humphreyscountyculturalmuseum.org/uploads/1/3/0/5/130541346/sepibif.pdf
    • http://www.issyshortissocietyandculture.com/uploads/1/3/0/7/130776118/5016596.pdf
    • http://monicalarsen.net/uploads/1/3/0/2/130272232/luxotoxorotamog.pdf
    • http://zero-waste-blog.com/uploads/1/3/0/3/130379391/xenigekunij.pdf
    • http://www.gold-globe.co/uploads/1/3/0/6/130621715/f49cf7.pdf
    • http://fantabulousfacepainting.com/uploads/1/3/0/5/130550903/f06565427ec5.pdf
    • http://beautecocktail.com/uploads/1/3/0/8/130814408/bojabagobub_tejese_bubodil_bofobago.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_off0000771f.bin
763c76e76745be479c661b90ba8e2ee7d22823ab7ff5b6c5de24459e2bb24127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771F 8932 bytes

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