Malicious PDF — malware analysis report

Static analysis result for SHA-256 635cc301e5454ebd…

MALICIOUS

PDF

37.1 KB Created: 2020-05-09 04:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb3cc9b2eac7395adf0e16a3f7ceec29 SHA-1: 56454cba37a6d7a0f6f860a162b58ee5de0ded3e SHA-256: 635cc301e5454ebd6009ef3aa3cc25c063c1dc685817478610e58ecb8aadf98f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, preventing a more detailed analysis of the specific lure.

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://tripanmarketing.com/uploads/1/3/0/9/130969129/130969129.html#letter+to+santa+template+word+doc
    • http://paydirtholdings.com/uploads/1/3/0/5/130539170/2e55f39d.pdf
    • http://brocknives.com/uploads/1/3/0/3/130379194/davedu.pdf
    • http://thepurposefulpen.com/uploads/1/3/0/5/130588846/9a6a5aa9eaf8701.pdf
    • http://gororealty.com/uploads/1/3/0/8/130814803/giwukex.pdf
    • http://suitecvino.com/uploads/1/3/0/6/130603971/jelozivuretifu_wesevakagu.pdf
    • http://berricobeef.com/uploads/1/3/0/2/130289294/zetuku_funirazulut.pdf
    • http://bigbluecostadelsol.com/uploads/1/3/0/8/130873784/sikupedifulolul.pdf
    • http://ess-sims.com/uploads/1/3/1/4/131483275/puxelef.pdf
    • http://clarksvillehomeinspectionpros.com/uploads/1/3/0/2/130288421/tapepuzojivu.pdf
    • http://positivelyrosellepark.org/uploads/1/3/1/4/131453330/72d9dae6603b0e.pdf
    • http://eljewelrydesign.com/uploads/1/3/0/6/130639131/kamogesus.pdf
    • http://dyologisticaintegrada.com/uploads/1/3/0/7/130776068/lakuki.pdf
    • http://paulinelabradors.com/uploads/1/3/0/5/130546803/3233703.pdf
    • http://saraivaservicoscontabeis.com/uploads/1/3/0/8/130874305/dukuxedapedogokij.pdf
    • http://oakland-sharp.com/uploads/1/3/0/4/130489958/benujov.pdf
    • http://acouturelife.com/uploads/1/3/0/6/130605453/kotobixoridilod.pdf
    • http://purplestore.net/uploads/1/3/1/4/131453869/wunekulufebuzeva.pdf
    • http://rideandtrain.com/uploads/1/3/1/8/131871768/2730807.pdf
    • http://whispersofheaven.org/uploads/1/3/0/7/130738984/zigug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006747.bin
37e23590e913ad799208958e5e5b0c0ebf27cba628e0f30c1327a58679319d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6747 10300 bytes

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