Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac12c43ffdcaf217…

MALICIOUS

PDF

42.4 KB Created: 2020-04-01 14:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07b40bcb79f8949fe5498df89f4b0351 SHA-1: 90c0988156c3a6c7a1397df2b76eb2ab3e30bc10 SHA-256: ac12c43ffdcaf217c1871345c5f12ee6fec75ebf2f2cdb16672b93968e42d605
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to frequency analysis and mentions the authoring application 'wkhtmltopdf'. The primary attack pattern appears to be a link farm designed to manipulate search engine results or redirect users to potentially malicious content hosted on the numerous external domains. No scripts were extracted, limiting the analysis of direct payload execution.

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://mossyoaklawnmaintenance.com/uploads/1/3/0/3/130379803/130379803.html#analisis+en+el+dominio+de+la+frecuencia+ejemplos
    • http://communityresourcecentersummerville.com/uploads/1/3/1/1/131163846/fdc8a8.pdf
    • http://eyeonsoap.com/uploads/1/3/0/4/130483454/jenolepotoni.pdf
    • http://thecarepost.net/uploads/1/3/0/8/130873863/9debdcf4def4.pdf
    • http://g3miningconsultants.com/uploads/1/3/1/4/131410747/2375673.pdf
    • http://mermaidsransom.com/uploads/1/3/0/5/130550789/pilodavusomuzofu.pdf
    • http://kimsaltusjohnston.com/uploads/1/3/1/0/131071114/8736016.pdf
    • http://blackoxdesigner.com/uploads/1/3/1/4/131453151/1592737.pdf
    • http://sohojungle.com/uploads/1/3/0/5/130539125/rebugame-wikoxazomuma-nevufunaxog.pdf
    • http://mail.friendsofthelfpl.org/uploads/1/3/0/6/130604434/8872841.pdf
    • http://cyrcertification.com/uploads/1/3/0/7/130776519/70431f52e4.pdf
    • http://houseoftileandsupply.com/uploads/1/3/0/3/130379583/tegagatimokega.pdf
    • http://hebridean.org/uploads/1/3/0/3/130379741/aa5af3c64db25.pdf
    • http://ucqclothing.com/uploads/1/3/0/4/130483158/tegatadijonipi.pdf
    • http://soulstonesstudio.com/uploads/1/3/1/0/131070402/kulerisofopomedefi.pdf
    • http://parkandvinyl.com/uploads/1/3/1/3/131398475/96f39.pdf
    • http://kleinerladen.org/uploads/1/3/0/7/130775016/8dc56.pdf
    • http://schutzengelfarm.com/uploads/1/3/0/5/130551387/jugiropi_nirozuxuka_dasitidafuxox_jakuxufo.pdf
    • http://jimwu.org/uploads/1/3/0/7/130738740/82d11c6c46e66c.pdf
    • http://8fairlee.com/uploads/1/3/0/6/130603855/nalelisubi.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_off000077c2.bin
1a532eab5fd9bf42cff3b3c5068fcf7258e1a9a75a1a6b545cf2a93b193dbce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C2 9536 bytes