Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc16cceffb4559…

MALICIOUS

PDF

42.8 KB Created: 2020-04-04 16:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 42a168cc1ddffa37cb0e321ee8dc5178 SHA-1: 94d9b0f2723bcada29b4a4951b051df0222f8cf5 SHA-256: 7bfc16cceffb45596e7241cb5620101a5f2cf8a1edd61d96f3263be59867c677
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The document body, though partially corrupted, contains references to project management terms and the authoring application, likely as a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious content or phishing sites.

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://siouxfallshomebuyer.com/uploads/1/3/0/8/130874180/130874180.html#ejercicios+de+diagrama+de+pert+y+cpm PDF link annotation
    • http://detroitretreat.com/uploads/1/3/0/2/130273798/77136ce4.pdfIn PDF document text
    • http://dealofthedaychevyz71.com/uploads/1/3/1/3/131380339/nowosasurotido.pdfIn PDF document text
    • http://boquetenaturehike.com/uploads/1/3/1/0/131070890/juxavotidape.pdfIn PDF document text
    • http://rwsecuritynews.com/uploads/1/3/0/7/130775103/terilofezimipovut.pdfIn PDF document text
    • http://theinvisiblecio.com/uploads/1/3/0/6/130604166/9802955.pdfIn PDF document text
    • http://peaceinchrist2018.com/uploads/1/3/0/9/130968992/goralakukedizoduteb.pdfIn PDF document text
    • http://thestudioat19main.com/uploads/1/3/0/2/130273884/9839811.pdfIn PDF document text
    • http://painsufferersspeak.com/uploads/1/3/0/2/130289177/rotuzaga-buratifetegoxi.pdfIn PDF document text
    • http://exquisiteencounters.org/uploads/1/3/0/3/130313343/6df254548e48f5.pdfIn PDF document text
    • http://bump-baby-beyond.com/uploads/1/3/0/6/130639192/gibipiroj-sabipebosonivo-mukes.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
🗂 Part of campaign: dealofthedaychevyz71.com 3 samples

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8C 9360 bytes
SHA-256: 7c9ba17d3d0a8826681dec4426261be6448ff84e61d5f32feea0773ab72507f4