Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f01c1a8a429339c…

MALICIOUS

PDF

82.4 KB Created: 2020-03-15 14:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: a86a180750079b0e93eaadf26223be45 SHA-1: 2ad3f1ed5afb7dcc42b6e82d6f35b27866076a83 SHA-256: 8f01c1a8a429339cedffb22c6c43e9bfd4233d9255f463c07dec412f91d953c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains. The document body, though heavily obfuscated, contains text related to 'Movies tamil 2017 free' and metadata indicating it was generated by wkhtmltopdf. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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://tem-brock.immobilien/uploads/1/3/0/7/130775570/130775570.html#movies+tamil+2017+free PDF link annotation
    • http://wongahill.com/uploads/1/3/0/3/130323232/8544811.pdfIn PDF document text
    • http://themoc.shop/uploads/1/3/0/2/130272387/5696198.pdfIn PDF document text
    • http://www.wigery.com.au/uploads/1/3/0/3/130379317/ludadoz.pdfIn PDF document text
    • http://www.mcafeeanticrime.com/uploads/1/3/0/5/130539287/samagokegemej-bavakowubo.pdfIn PDF document text
    • http://www.bti-bookofnumbers.fr/uploads/1/3/0/7/130739766/5600596.pdfIn PDF document text
    • http://writingworks.co.uk/uploads/1/3/0/6/130604740/81a0b4216e.pdfIn PDF document text
    • http://yanibear.com/uploads/1/3/0/5/130590058/5312bdea7afb9.pdfIn PDF document text
    • http://jacquelinegreenough.com/uploads/1/3/0/5/130588688/jijotepugodad-feroti.pdfIn PDF document text
    • http://infosoldier.com/uploads/1/3/0/2/130273982/9748564.pdfIn PDF document text
    • http://proximalevis.com/uploads/1/3/0/3/130323295/ninoxegasosakoj_pojix_zotomusuxazowep.pdfIn PDF document text
    • http://sandandgraveldelivery.com/uploads/1/3/0/2/130273735/roxaxode.pdfIn PDF document text
    • http://640stonehouseln.com/uploads/1/3/0/5/130588278/9749818.pdfIn PDF document text
    • http://debeuningseboerderij.nl/uploads/1/3/0/6/130604748/b0696fe88.pdfIn PDF document text
    • http://qzb12.brdge.org/uploads/1/3/0/3/130313784/8e1e3cb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 9168 bytes
SHA-256: 670d79361d373e2a97db603c3132924f6bb5f18f7cb0315e30b256cdb2a78dda
font_01_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 16164 bytes
SHA-256: 32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56

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