Malicious PDF — malware analysis report

Static analysis result for SHA-256 a318b77845d15b77…

MALICIOUS

PDF

37.0 KB Created: 2020-05-21 22:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bb73de505fdc5a672b14464f7b681e2a SHA-1: 0eced50e874121e13988aadafb12e2b650fb9dd8 SHA-256: a318b77845d15b77c962c050e9affed68e68193f64dba15e63021831775c986f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These links likely lead to malicious websites, potentially for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xingheyulechengguanwang.br3h.com/uploads/1/3/0/7/130739287/130739287.html#no%25C3%25A7%25C3%25B5es+de+farmacologia+enfermagem PDF link annotation
    • http://farzayee.com/uploads/1/3/1/3/131381976/9263e460.pdfIn PDF document text
    • http://coolschoolportraits.com/uploads/1/3/0/6/130639565/mujimonavaxox.pdfIn PDF document text
    • http://tcsavet.com/uploads/1/3/0/6/130605164/sizoweli-lagubikujak-xusisanerej.pdfIn PDF document text
    • http://9f62dcb125.com/uploads/1/3/0/8/130874141/06cd56e7a.pdfIn PDF document text
    • http://rothgalloassociates.com/uploads/1/3/0/4/130489168/gadeweka.pdfIn PDF document text
    • http://mvisionconstruction.com/uploads/1/3/0/3/130313200/fifavovivel-kimavobijirime.pdfIn PDF document text
    • http://redlinedeputyinspectionsinc.com/uploads/1/3/0/5/130590273/366915.pdfIn PDF document text
    • http://iconichomesolutions.com/uploads/1/3/0/7/130775472/9448044.pdfIn PDF document text
    • http://gbp-avocates.ch/uploads/1/3/0/8/130814535/be63552008.pdfIn PDF document text
    • http://londonwingchunkungfu.com/uploads/1/3/1/0/131070173/betetovazajelememat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 12240 bytes
SHA-256: caa81f4974a901bed405ee23e5b756de6a1b8a99e4d71e399644f9c7b92e58fa