Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b09c96eeef5c09…

MALICIOUS

PDF

46.4 KB Created: 2020-04-03 04:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0817ed0887caf4e1d7ed7b4ede2b4212 SHA-1: d11358c5357337e4a485a0604d8b232f7281a2ff SHA-256: d4b09c96eeef5c09f214652bfde1bb60ece441d48c3df7503d7032a95f7a6c5b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to artificially inflate search engine rankings or distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external PDF links. The document body itself is largely unreadable, but the embedded URLs are the primary indicators of malicious intent.

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://rehphotography.org/uploads/1/3/0/7/130738912/130738912.html#masa+atomica+se+carbono
    • http://vbhandsonmuseum.com/uploads/1/3/0/7/130775127/rinosunuxedekaki.pdf
    • http://markustv.com/uploads/1/3/1/1/131163653/wipuwex_kijosiraliru.pdf
    • http://classicmassagestudio.com/uploads/1/3/0/3/130313489/mutabewupovugap.pdf
    • http://totallyradgamestore.com/uploads/1/3/0/5/130547069/1a788a.pdf
    • http://ebktmlimited.com/uploads/1/3/0/6/130620997/petum.pdf
    • http://juliewilkening.com/uploads/1/3/0/6/130639123/gozibivizi.pdf
    • http://strikezonenorthwood.com/uploads/1/3/0/6/130620843/zexofipota-wedorofurire.pdf
    • http://neilsalem.com/uploads/1/3/0/5/130589132/biwuke_tutudis.pdf
    • http://andiesangels.com/uploads/1/3/1/0/131069961/ditilodojarakeg-xetixoxofetum.pdf
    • http://reduxcustoms.com/uploads/1/3/0/4/130477234/tefomupu.pdf
    • http://akizusushi.com/uploads/1/3/1/4/131453031/silizapaz_kibajex_tikikafonuwazet.pdf
    • http://blacklocustpastures.com/uploads/1/3/0/8/130874139/566539914d4.pdf
    • http://viantrucking.com/uploads/1/3/0/7/130775334/rovasuwovosos-sotiv-tojeriwejonazal-siselolone.pdf
    • http://themightofmotherrussia.com/uploads/1/3/1/4/131453081/volomalepoxe_tavetig.pdf
    • http://mvrmoto.com/uploads/1/3/0/6/130639926/eb7b7e3e5d8e17b.pdf
    • http://buybeautysamples.com/uploads/1/3/0/5/130539022/6215c6da463b54.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_off00007dea.bin
6d24445bccd413a515d827de0a55c61cd7a6dcae236ffbe0b0c224a4ea90b334
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 9808 bytes
font_01_sfnt_off0000a10f.bin
319d595fb312eedf01caf967cab4872271447d9372fae563750c748d84c54d44
pdf-font-stream PDF embedded font (sfnt) at offset 0xA10F 2656 bytes