Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa580e0af0b3785…

MALICIOUS

PDF

39.7 KB Created: 2020-03-26 08:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 8ae6ebe826aebec6002103bd6d76b0ac SHA-1: 8ddccc27e559c1c3c447b57b0641eb4fcd695a1b SHA-256: dfa580e0af0b3785acd55286746fdc16db45ccb0b2ab7e5500da73037d192f72
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, includes a URL that points to a page on nelsonfirm.com, which is also listed among the extracted URLs. This suggests the primary function of this PDF is to redirect users to a multitude of other websites, likely for SEO spam or to host further malicious content.

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://nelsonfirm.com/uploads/1/3/0/4/130489446/130489446.html#how+to+say+grandmother+in+french PDF link annotation
    • http://repnstep.net/uploads/1/3/0/4/130435721/fametugefina_bujojobotexij_ratupimovupo.pdfIn PDF document text
    • http://www.chestpaindoctor.com/uploads/1/3/0/6/130604305/valulasamavu-ledebapa-zesedepe-dibuz.pdfIn PDF document text
    • http://rstickann.com/uploads/1/3/1/0/131070146/wutijila.pdfIn PDF document text
    • http://www.mrsflinksclassroom.com/uploads/1/3/0/4/130436439/9f7f28c66062.pdfIn PDF document text
    • http://cashdealsmichigan.com/uploads/1/3/0/3/130379226/b92d798b.pdfIn PDF document text
    • http://middleclassempowermentzone.org/uploads/1/3/0/7/130776817/zewukowobife.pdfIn PDF document text
    • http://collegebelly.com/uploads/1/3/0/3/130324289/897c2cb.pdfIn PDF document text
    • http://onlygodcanjudgeus.com/uploads/1/3/0/5/130539370/balutag-pujotevol-xidugu.pdfIn PDF document text
    • http://xserve.tkkmom.ac.nz/uploads/1/3/0/6/130620574/3a6f70c8aa8b0.pdfIn PDF document text
    • http://awpcmarianna.com/uploads/1/3/0/6/130605073/9327307.pdfIn PDF document text
    • http://jarrodhaas.com/uploads/1/3/1/1/131164297/mabegiwenej_tozosuru.pdfIn PDF document text
    • http://cargo-toolkit.org/uploads/1/3/0/3/130323635/7776819.pdfIn PDF document text
    • http://thedresscodeca.com/uploads/1/3/0/6/130622023/daf5df.pdfIn PDF document text
    • http://velhopontonet.com/uploads/1/3/0/3/130379082/a5ef03.pdfIn PDF document text
    • http://www.autorickshaw.com.au/uploads/1/3/0/5/130546096/6247035.pdfIn PDF document text
    • http://saishakticenter.com/uploads/1/3/0/5/130551331/6082129.pdfIn PDF document text
    • http://www.cabranegra.net/uploads/1/3/0/3/130323103/5486475.pdfIn PDF document text
    • http://knuckleswhiterock.com/uploads/1/3/0/6/130604315/zovuxariz.pdfIn PDF document text
    • http://nashobavalleyextractco.com/uploads/1/3/0/6/130620950/pojavisedum.pdfIn PDF document text
    • http://alphonseasylum.com/uploads/1/3/0/2/130292125/tarufumivumamen_vukobuk_selipibonadufu_peganatolebilas.pdfIn PDF document text
    • http://comedysanantonio.com/uploads/1/3/0/5/130551661/4f86a55845088.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

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 7736 bytes
SHA-256: 6bf85acef4d402290e3041d71b94b5418624ed3c3347beaba6671c011fc530f0

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