Malicious PDF — malware analysis report

Static analysis result for SHA-256 526538d740046794…

MALICIOUS

PDF

30.8 KB Created: 2020-06-18 07:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 4ce85ab4cf43cad33202e0dbb4ac34b2 SHA-1: 81ee0190fcc79bd73215651de210ca37a55bfae6 SHA-256: 526538d740046794c4d41593b01a8d232e47928d555fc25363d0cca00bb4fe14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document is identified as an image-only lure, typical of phishing campaigns. It contains numerous external links, with the primary one pointing to a suspicious URL. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to obscure the true malicious destination or to leverage SEO techniques for distribution. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 30 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sisterhoodtravels.voyagerwebsites.com/uploads/1/3/0/2/130291561/130291561.html#brother+hl2270dw+manual PDF link annotation
    • http://hempliving.us/uploads/1/3/1/0/131069890/fewaxikeki.pdfIn PDF document text
    • http://sebtaxpreparation.com/uploads/1/3/2/6/132682030/puxojor-leruwilevasoxas-famajavik.pdfIn PDF document text
    • http://mybloordale.com/uploads/1/3/1/1/131164387/6ea6cd754094.pdfIn PDF document text
    • http://creativeconcreterentalandsupply.com/uploads/1/3/1/0/131070010/2856792.pdfIn PDF document text
    • http://cardinalrealtyllc.com/uploads/1/3/0/6/130620678/zokexe.pdfIn PDF document text
    • http://tassietucker.net/uploads/1/3/1/3/131383982/b57a5c4e8c7ca.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x422C 5216 bytes
SHA-256: a5cfad79a483cc0c5e4ab93f0afa9158ed76e66600f94c662d31b603a61f7e21
font_01_sfnt_off000053d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53D5 8208 bytes
SHA-256: 282299fdcecd495a8ee70c758300f3427096bca54406a6a24f10d824e25fd001

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