Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f60b448a028cd1…

MALICIOUS

PDF

31.8 KB Created: 2020-06-21 04:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d4edc3f45259c1e217649e13eccc3bc SHA-1: 1fcebd08d2cbfe8d1565fa77aec1c0c5cf958af2 SHA-256: 83f60b448a028cd1ead9e949215fb926288367a2e8de9026881f8252d69f3bcf
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on various domains, suggesting a link farm or spam campaign. The document body, though partially corrupted, contains text referencing 'Komplete kontrol manual' and includes an initial URL, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent, likely for phishing or distributing 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://otherworldlyart.com/uploads/1/3/2/7/132712451/132712451.html#komplete+kontrol+manual
    • http://simplecatholicism.org/uploads/1/3/1/3/131379914/529c52.pdf
    • http://yournaturalremedy.shop/uploads/1/3/0/2/130274154/6383616.pdf
    • http://kxxvii.com/uploads/1/3/0/5/130540214/07b996.pdf
    • http://innovacionpublicitariamagenta.com/uploads/1/3/1/4/131438362/xinaxa.pdf
    • http://projectpath.co.uk/uploads/1/3/2/3/132303147/nujabalimudod.pdf
    • http://roxannecoffey.com/uploads/1/3/0/4/130435784/469822.pdf
    • http://katiezimmermannmft.com/uploads/1/3/0/6/130639350/zorepuz-pidupu-letolova.pdf
    • http://frascatorelandscapingct.com/uploads/1/3/0/6/130604349/9975168.pdf
    • http://angela-swanson.com/uploads/1/3/1/8/131872107/6941637.pdf
    • http://christopherandnatalie.com/uploads/1/3/1/6/131606469/pomab_fuvovafawu_bibija_fagedotopugev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000422f.bin
db8e79269ff631a63b5111a2b682b76198afdc03c64ca2fe03be03874b3205ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x422F 4656 bytes
font_01_sfnt_off000051df.bin
3ed217423da87516ac03e300753709e7e1c181426375113bcdfd970db8793655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51DF 9724 bytes

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