Malicious PDF — malware analysis report

Static analysis result for SHA-256 0942a27a5fb0f67b…

MALICIOUS

PDF

40.4 KB Created: 2020-04-05 10:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c2e3051679ad4e0ecc09d1a3b59f30b SHA-1: c8ab4c8e9ff08a2f00e14f6afa459fefae8ce814 SHA-256: 0942a27a5fb0f67b9c22374e27fa01fdbaad9334eb72a017c7c4f9b85416ebc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links to various domains, many of which are structured as SEO-optimized PDF files. This suggests a link farm or redirection scheme designed to drive traffic or host further malicious content. The presence of these numerous external links is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8879205-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8879205-0
  • 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://lastallegianceapparel.com/uploads/1/3/0/8/130814717/130814717.html#ejercicios+de+calculo+mental+para+secundaria+segundo+grado
    • http://melaniedestin.com/uploads/1/3/0/4/130476183/sigojuzalu.pdf
    • http://savimae.com/uploads/1/3/1/4/131453045/ripupowafima-fofafejo.pdf
    • http://baselinefitnesstraining.com/uploads/1/3/0/4/130478307/227a3f230e0.pdf
    • http://qualitymanagmentsytem101.com/uploads/1/3/0/5/130539370/954c7e5390be45.pdf
    • http://cydanceintensive.com/uploads/1/3/0/4/130489377/vosuwipod.pdf
    • http://shopadrenalinejunkie.com/uploads/1/3/0/9/130969758/tuduvozabone-jobune-fefakifobexilu-jariv.pdf
    • http://frenchiekissesxo.com/uploads/1/3/0/4/130435783/famarozezuvupu_vivoxunamuki_nojem_puxategebasapu.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_off0000714e.bin
49e44ca074ad91856e24d249cf48f6ab1ee7876be66f1e9f485a0002c7df2954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 9124 bytes

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