Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8606ed14e61dd4…

MALICIOUS

PDF

37.6 KB Created: 2020-04-12 15:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f1b19435c798cd92f06127e46cb65c3 SHA-1: c3be344709a781fb603c922534eaacca0b18991e SHA-256: 5f8606ed14e61dd410132f1ecef75d0fbd7d3d3e2494788b94526032d33957a2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to other PDF files hosted on various domains. The document body, though partially corrupted, contains text related to a herbicide label and includes a prominent URL that likely serves as a lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://msb-art-integration.com/uploads/1/3/0/9/130969702/130969702.html#gordon%27s+avenue+south+herbicide+label
    • http://wpmthetypewritershop.com/uploads/1/3/0/8/130813827/5806345.pdf
    • http://chorngroup.com/uploads/1/3/0/4/130483808/roditivojikekib.pdf
    • http://geminihairgem.com/uploads/1/3/0/6/130604429/pogubek.pdf
    • http://moukarzelcarpentry.com/uploads/1/3/0/2/130271179/56e8e875.pdf
    • http://vegasjunkmovers.com/uploads/1/3/1/6/131606346/ea154fdbd.pdf
    • http://rogerstentandawning.com/uploads/1/3/0/5/130588971/kinezubof.pdf
    • http://childrensentertainers.services/uploads/1/3/0/8/130874521/d25158d6106.pdf
    • http://jackigang.com/uploads/1/3/1/0/131070151/nifumikerudato.pdf
    • http://radiantlifeacademy.org/uploads/1/3/0/7/130738738/8042037.pdf
    • http://wciypinstitute.com/uploads/1/3/1/3/131383934/6631390.pdf
    • http://zeladvisorygroup.net/uploads/1/3/0/4/130475918/mirodefaseno.pdf
    • http://caninecocktailpawty.com/uploads/1/3/0/2/130271206/sivitowa.pdf
    • http://fnqoilsfryersolutions.com/uploads/1/3/0/6/130621066/sesajafere.pdf
    • http://ulcrownhospitality.com/uploads/1/3/1/3/131380969/fadc852771d28c.pdf
    • http://oliviarosepaperco.com/uploads/1/3/0/5/130551661/kunufov_tuvinejafofuwu_geguw_kenusofukofim.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_off000068d6.bin
2995199936811f93a72d5146144aec9e94c99170e6c741cac427d2a4f14244fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D6 8616 bytes

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