Malicious PDF — malware analysis report

Static analysis result for SHA-256 6604447b457f2670…

MALICIOUS

PDF

34.7 KB Created: 2020-03-21 02:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6f1de6c7ff8a670746e7a2069c2cf04 SHA-1: b2500d5eb1f713e2f0c4c921664c9b251a37e40c SHA-256: 6604447b457f267067b776f8e4d6dca62901f130aaab06d19c86dd19a1d47fc9
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 tactic to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the embedded URLs are the primary indicators of this activity. No scripts were extracted, limiting the analysis of direct execution or payload delivery.

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://vancoursynthetics.net/uploads/1/3/0/6/130622000/130622000.html#antagonistas+de+los+receptores+beta+adrenergicos+pdf
    • http://accesevaluation.com/uploads/1/3/0/2/130272551/3346722.pdf
    • http://younglivingdaily.com/uploads/1/3/0/6/130639791/redameza.pdf
    • http://theconnectedlife.us/uploads/1/3/0/6/130639336/jalekufi.pdf
    • http://mollymaefoundation.com/uploads/1/3/0/8/130874001/norilodo.pdf
    • http://akkijyrkka.com/uploads/1/3/0/6/130604113/pupiwuli.pdf
    • http://xi-eleven.com/uploads/1/3/0/6/130621369/d46f84e656.pdf
    • http://mta-sts.mx.wallingfordanddidcotosteopathy.com/uploads/1/3/0/7/130776148/4bd59560cfd0df.pdf
    • http://frankteran.com/uploads/1/3/0/4/130483138/jirizonugado.pdf
    • http://fearfullyfierce.com/uploads/1/3/0/4/130436482/buzexo-fovari-nikevavileb-gejisavona.pdf
    • http://www.lutherlicense.org/uploads/1/3/0/7/130738652/4960533.pdf
    • http://crystalchilleddistilled.com/uploads/1/3/0/8/130813922/puxosiwetis_nirapusujin.pdf
    • http://mail.steppingstonesacademywv.com/uploads/1/3/0/3/130379651/4c862eb24.pdf
    • http://byshannonmalone.com/uploads/1/3/0/6/130639406/wupewer_gipubowixaman.pdf
    • http://yourcosmeticmall.com/uploads/1/3/0/9/130969151/8ad56.pdf
    • http://notquitenans.com/uploads/1/3/0/2/130291591/7564901.pdf
    • http://blissfulwanderers.com/uploads/1/3/0/6/130605080/lerosidomaran-mutajene.pdf
    • http://agilitymassage.com/uploads/1/3/0/5/130588345/4429177.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_off00005d66.bin
7ff1911d50471cde6784a336e3653be01ff40551979d5e21858a9608ede50a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D66 8096 bytes

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