Malicious PDF — malware analysis report

Static analysis result for SHA-256 b740ebf9e9f31837…

MALICIOUS

PDF

143.1 KB Created: 2020-04-12 01:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1caebee319bd967dfb7cb84a81ff63ff SHA-1: 95a5f8b58e06096614123d420cf1a69bed597435 SHA-256: b740ebf9e9f31837ec2008897f555876786d6dea12e59daf7bafa947493fe595
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body itself contains a URL that appears to be a lure, directing users to a page with a title that translates to 'What does getting eventualities mean'. This suggests a phishing or SEO spam tactic, where the PDF acts as a gateway to a network of malicious or spam-related websites. The ML classifier strongly supports the malicious nature of this PDF.

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://nexisnailsystems.com/uploads/1/3/0/5/130590314/130590314.html#o+que+significa+getting+eventualidade
    • http://fit2gofitness.com/uploads/1/3/1/4/131437544/fukonomupixud-sixumokawivi-rogewodoredive-mipipasin.pdf
    • http://whiterockmedical.com/uploads/1/3/0/7/130775612/7579304.pdf
    • http://thesunofspain.com/uploads/1/3/0/7/130740508/d9f605.pdf
    • http://healthfullyyoursnutrition.com/uploads/1/3/0/9/130969386/bolugo-fefapobidigexem-wakiparena-vapaw.pdf
    • http://mlazarads.com/uploads/1/3/0/5/130551262/xepitegunidad.pdf
    • http://sealavienj.com/uploads/1/3/0/6/130620506/pazob_nonulixotez.pdf
    • http://burdentransportation.net/uploads/1/3/0/5/130590209/aff82ed5.pdf
    • http://hilomadrid.com/uploads/1/3/0/8/130813985/dorolusaxa.pdf
    • http://robrikertraining.com/uploads/1/3/1/4/131406118/negumoweferur.pdf
    • http://realtimecases.org/uploads/1/3/0/2/130289738/teveposik.pdf
    • http://ktabcleaningandlandscaping.com/uploads/1/3/1/4/131438157/xepufejutipibivo.pdf
    • http://stevendgibson.com/uploads/1/3/0/8/130814902/bakujobidutom_zeninir.pdf
    • http://artinacloud.com/uploads/1/3/1/3/131398369/xavajasok.pdf
    • http://ttcclassics.com/uploads/1/3/0/2/130289658/todujumure_pubod_romad.pdf
    • http://apathofwellnessnj.com/uploads/1/3/1/4/131406722/3043902.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f9d5.bin
84d4967e17f14679a0227ae3f04e68fce6892e078ba14247f4410990fdaf565d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9D5 12916 bytes
font_01_sfnt_off000223b9.bin
555bdb7d87efa34b3073bf5be73fc02537e9be365820b1f587781642ed920211
pdf-font-stream PDF embedded font (sfnt) at offset 0x223B9 2680 bytes