Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7343a8a7f890c5…

MALICIOUS

PDF

42.2 KB Created: 2020-03-25 14:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8175623e9323de0ef4ba691d28b9454 SHA-1: 361cc6694e4322c4d58dd8bea0b2858c1e5a2dbd SHA-256: 1c7343a8a7f890c56c330a16261f3c15fc949c4f57f8aecd713ca1a72ae21411
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the extensive link farm.

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://estudio-thuban.com/uploads/1/3/0/2/130291493/130291493.html#que+es+el+apio+verdura
    • http://dixieraised.com/uploads/1/3/0/2/130272516/farig.pdf
    • http://nkbassetmanagement.com/uploads/1/3/0/2/130272976/mitavuzujog_kizukofilarex_fotudo.pdf
    • http://nintaipartners.com/uploads/1/3/0/4/130489386/6288562.pdf
    • http://calsafe.net/uploads/1/3/0/7/130738631/rowifodejuguj.pdf
    • http://www.artisticrebelliongroup.ca/uploads/1/3/0/5/130588867/43dfb57441297.pdf
    • http://norfolknyfire.org/uploads/1/3/0/2/130270834/jixibepef-vedisudogov-meniz-gerefuwane.pdf
    • http://fr.mahlakiyaelblida.org/uploads/1/3/0/3/130323748/mimimekexigutisipa.pdf
    • http://springlakeengineering.com/uploads/1/3/0/7/130776416/1343e83a.pdf
    • http://antiochmissionarybaptist.org/uploads/1/3/0/4/130476712/wowibukaxuxevis.pdf
    • http://mindfuldemocracy.org/uploads/1/3/0/6/130639658/zitikopakewu.pdf
    • http://blogapna.com/uploads/1/3/0/3/130323285/331143.pdf
    • http://sweetdreamsmarin.com/uploads/1/3/0/4/130435988/d4bcc47c6d.pdf
    • http://www.tenn-law.com/uploads/1/3/0/4/130435745/2888169.pdf
    • http://genesistransportsolutions.com/uploads/1/3/0/6/130621132/joxagawafivumibuk.pdf
    • http://handlcondoservicesinc.com/uploads/1/3/0/3/130324419/5680845.pdf
    • http://liquorlawsvt.net/uploads/1/3/0/4/130435631/setonodo.pdf
    • http://mesfsl.com/uploads/1/3/0/6/130605240/3c905fb9a.pdf
    • http://www.jocoscience.com/uploads/1/3/0/8/130814960/robewuninetilo_nusesewegef_fowuwedibibo_bazaxipaj.pdf
    • http://slayslawncare.com/uploads/1/3/0/8/130874434/renuturebivurewemapo.pdf
    • http://ogangii.com/uploads/1/3/0/5/130590666/fiwofedesuvi_lowozubawuno_mufewedubura_ziruramisuzese.pdf
    • http://jailhouselawyers.com/uploads/1/3/0/7/130739107/bagibek.pdf
    • http://hyuk.info/uploads/1/3/0/6/130639172/wogimusobuwejuzeder.pdf
    • http://inspirationsteacompany.com/uploads/1/3/0/6/130621098/5362720.pdf
    • http://feedtheknead.com/uploads/1/3/0/5/130588595/1349509.pdf
    • http://mypakalolochocolates.com/uploads/1/3/0/3/130379696/nanizil_fedogakajusoku_guvuze.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_off00007a5e.bin
29a174963e24b784e4c102cdf1d1285a84d52363cb98ebe4643b54c4a2e0d344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5E 8512 bytes

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