Malicious PDF — malware analysis report

Static analysis result for SHA-256 6958ccc63fb0681a…

MALICIOUS

PDF

43.2 KB Created: 2020-06-05 10:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 671d8c43fe718125954a0a2e39ee7c57 SHA-1: 3ca422196ca9e7878afa6af54404b5fec1b2f317 SHA-256: 6958ccc63fb0681a3ee03be3db9593aeabfc1db5158466247afa13d4127d0ced
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. The embedded URLs suggest an attempt to direct users to potentially malicious or SEO-abusing content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a malicious intent to redirect users.

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://switalia.com/uploads/1/3/0/7/130739904/130739904.html#fishing+guide+stardew
    • http://thenailcandy.com/uploads/1/3/0/4/130477633/5529603.pdf
    • http://adminmichelle.com/uploads/1/3/0/8/130815115/waxexokenerasuzimub.pdf
    • http://greenshotsrealestatephotography.com/uploads/1/3/0/6/130639643/sidod_didepetewodaga_dawemir_jiviwobozejefu.pdf
    • http://philadelphiatemple.org/uploads/1/3/1/3/131384638/a193017eaac.pdf
    • http://aestheticbeautytreatments.com/uploads/1/3/1/6/131606861/mijulusil.pdf
    • http://advancealarm.ca/uploads/1/3/0/6/130621450/fd2e02c42.pdf
    • http://superproproductions.com/uploads/1/3/0/3/130312937/vetuwuren-fewuxoriwikefab-xevanawokuk-gatazudedave.pdf
    • http://lemongrasskauai.com/uploads/1/3/1/3/131398088/xapapuwu.pdf
    • http://wearefue.org/uploads/1/3/1/3/131383453/5969810.pdf
    • http://missrosieweddingsandevents.com.au/uploads/1/3/0/4/130483903/luvilananad-reberimobale-wobesesemud.pdf
    • http://pump-culture.com/uploads/1/3/0/4/130489627/8e13a16cff.pdf
    • http://switalia.com/uploads/1/3/0/7/130739904/terms.html
    • http://switalia.com/uploads/1/3/0/7/130739904/dmca.html
    • http://switalia.com/uploads/1/3/0/7/130739904/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rifuxovakefo.files.wordpress.com/2020/06/4691620522.pdf
    • https://narurelo.files.wordpress.com/2020/06/28506554414.pdf
    • https://tirafeb.files.wordpress.com/2020/06/42669694179.pdf
    • https://nexufig.files.wordpress.com/2020/06/datesodiveweku.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e0d.bin
3a31aa4a17da1631d1fbf795f74a1e9284d267bca17ef46d8560b75a3d413f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 10212 bytes