Malicious PDF — malware analysis report

Static analysis result for SHA-256 50574422a84fde28…

MALICIOUS

PDF

44.5 KB Created: 2020-03-11 14:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e7c198b39c082371997c2d3a4d95fcb SHA-1: ba836fbc188110d213453416929185ed9dfa047d SHA-256: 50574422a84fde2850da18d270fd4f0ba25b7e3fb55f4799ea4a548af26e5e79
96 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. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded URLs likely lead to phishing pages or further malware downloads. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, indicating it was likely generated programmatically to host these links.

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://cpanel.jacquelineclewis.com/uploads/1/3/0/8/130874641/130874641.html#adjetivos+irregulares+con+su+forma+comparativa+y+superlativa+en+ingles
    • http://www.frolishformilton.com/uploads/1/3/0/4/130436049/jefekarafeki.pdf
    • http://mta-sts.synchealthfit.net/uploads/1/3/0/4/130488779/kubebe.pdf
    • http://thehallofrecords.info/uploads/1/3/0/5/130541004/5947054.pdf
    • http://liviace.me/uploads/1/3/0/4/130488812/4345581.pdf
    • http://boxpact.com/uploads/1/3/0/7/130738998/0ed81d633.pdf
    • http://www.hicsa.org/uploads/1/3/0/6/130621261/6520a6abc64.pdf
    • http://embodiworksgolden.com/uploads/1/3/0/6/130621882/2532061.pdf
    • http://webmail.gortonsfloors.com/uploads/1/3/0/7/130776727/mazojilos-lewelugov-kokon.pdf
    • http://bashfitness.com.au/uploads/1/3/0/4/130483537/6331176.pdf
    • http://mta-sts.jackieyin.com/uploads/1/3/0/5/130550873/c6ae2e.pdf
    • http://www.retiringinvirginia.com/uploads/1/3/0/6/130639904/31959d537e.pdf
    • http://www.spinorth.net/uploads/1/3/0/3/130379096/pejigozezojaji-daregenexelakut-matoxusudaf-winofajor.pdf
    • http://www.ceeartfair.com/uploads/1/3/0/7/130776212/dexerelita_gazokuke.pdf
    • http://activhealthadmin.com/uploads/1/3/0/7/130739699/8003221.pdf
    • http://www.mtsu.ruf.org/uploads/1/3/0/6/130621142/sojebaguvi_butupuwavawaxep_lafipixe.pdf
    • http://fitosworld.com/uploads/1/3/0/6/130605217/dadumafidumadudeje.pdf
    • http://hendrickassociates.com/uploads/1/3/0/8/130873802/2147167.pdf
    • http://denverlawreview.club/uploads/1/3/0/7/130739280/tedavudoxetun-domarubati-medofekixa-jozix.pdf
    • http://organiccrafttea.com/uploads/1/3/0/4/130489162/5151620.pdf
    • http://www.missstacies.org/uploads/1/3/0/6/130620443/f98b7005c.pdf
    • http://too-perfect.com/uploads/1/3/0/2/130272587/posedubudurupogeko.pdf
    • http://whrsdinner.com/uploads/1/3/0/7/130740244/b3ce4ab3.pdf
    • http://richmondacupuncturist.com/uploads/1/3/1/0/131070367/4451753.pdf
    • http://alexandrajosutton.com/uploads/1/3/0/6/130604238/4d006d65a2d5.pdf
    • http://richmondacupuncturi
    • 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_off00008197.bin
f70124d4ef55d59a3b455e114c767d45a8788cc1b2f71b9c6bab3590669f7ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 8688 bytes

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