Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedb6ffdd855e3d2…

MALICIOUS

PDF

52.2 KB Created: 2020-04-05 16:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e078fe9c604bac45ff1580551f4794f5 SHA-1: 4091b7eebcc26519846e394353ec84e78115ad1c SHA-256: fedb6ffdd855e3d25f703cf8659b836ba31edf8cb2366dd47ad2b2a4df23f341
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains the phrase 'Orden de prioridad de los operadores aritmeticos' and references wkhtmltopdf, suggesting it might be a lure document. The primary function appears to be directing users to a network of linked PDF files hosted on various domains, likely for SEO spam or to distribute 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://thewesternstyleguide.com/uploads/1/3/0/5/130588266/130588266.html#orden+de+prioridad+de+los+operadores+aritmeticos
    • http://robdonaldcoaching.com/uploads/1/3/0/7/130740202/suvigapugu.pdf
    • http://bellafiore-charlotte.com/uploads/1/3/0/8/130813332/monen.pdf
    • http://tk2services.com/uploads/1/3/0/2/130289380/37bfe7490217.pdf
    • http://myoppconsulting.com/uploads/1/3/0/4/130489933/gupusuwopa-nugomozeb-polujinox.pdf
    • http://armentalandscapeco.com/uploads/1/3/0/3/130323407/8594760.pdf
    • http://alpinwork.eu/uploads/1/3/0/9/130969699/1413198.pdf
    • http://gustafsonsjerky.com/uploads/1/3/0/2/130289292/637911.pdf
    • http://austintexasevents.com/uploads/1/3/0/9/130969310/pojivukune.pdf
    • http://protectamericasborders.com/uploads/1/3/0/5/130545447/5560981.pdf
    • http://ahnadunnwilder.com/uploads/1/3/0/6/130621161/6613645.pdf
    • http://intentionalfamilyheritage.com/uploads/1/3/0/6/130603982/pevimopapalokarebi.pdf
    • http://jr-weddings.com/uploads/1/3/0/8/130813966/84c0cb6.pdf
    • http://digitalbusinessedgewebsitepreview1.com/uploads/1/3/0/7/130775632/3328315.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b36.bin
d045e10ba6bef28521a78edf4bf70c203bf00309e2d081a9626ead9b81091590
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 11104 bytes
font_01_sfnt_off0000a311.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA311 2652 bytes
font_02_sfnt_off0000ac78.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC78 16036 bytes