Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bccdc88b08b38a…

MALICIOUS

PDF

30.1 KB Created: 2020-03-13 06:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 3ccabfb74bcf91e75319d8c6adfd0ee3 SHA-1: 32535f688d91b878fa29fe7f67de6b487bf0bf97 SHA-256: 86bccdc88b08b38a0f00d759aedc41ebad5e2aa5d8255b609b9d4651f7750adc
136 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 are algorithmically generated and point to other PDF files. This behavior is indicative of a link farm or SEO spam technique, likely intended to direct users to malicious content or phishing sites. The document's content, presented as a tape data sheet, is a lure to encourage clicks on these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://74-123-75-232.mgwnet.com/uploads/1/3/0/8/130814208/130814208.html#3m+3340+tape+data+sheet PDF link annotation
    • http://11parishes.com/uploads/1/3/0/6/130604391/4064222.pdfIn PDF document text
    • http://veronikasafarova.com/uploads/1/3/0/5/130588548/fidudelije_jopuvux_garakuso_gofagijazivifi.pdfIn PDF document text
    • http://littlemillcreek.net/uploads/1/3/1/0/131071262/koxetogemu_jowigezidik_gegafulu.pdfIn PDF document text
    • http://walshhallnd.com/uploads/1/3/0/6/130621393/770160.pdfIn PDF document text
    • http://thedivinealignment.com/uploads/1/3/0/2/130271240/3440636.pdfIn PDF document text
    • http://mahmoudawad.net/uploads/1/3/0/7/130775704/5011523.pdfIn PDF document text
    • http://raykakobiella.com/uploads/1/3/0/3/130313434/6972011.pdfIn PDF document text
    • http://rohitiswrite.com/uploads/1/3/0/4/130436125/5994391.pdfIn PDF document text
    • http://northwesthennepinfamilyservicecollaborative.com/uploads/1/3/0/6/130605112/rifotobedelufir_jofires_bipez_zofogotulezo.pdfIn PDF document text
    • http://honeycombbooks.org/uploads/1/3/0/4/130489132/2d3cfe1caa9.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D7B 7336 bytes
SHA-256: 27f6ff63fee403c7166fed01a458814b338859eda9222ea75851e4a62d7c7bc2