Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d685ec1adcfe09…

MALICIOUS

PDF

37.5 KB Created: 2020-04-11 00:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cfe6f0669bf6884d40790df7ecc4430 SHA-1: 494c65b025965077f03ebc31999b93d37758e566 SHA-256: 83d685ec1adcfe09ec71d0c40c786678b33bd882b1811836830fe4976eb11dbb
114 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly indicates maliciousness, and the structure points towards a phishing or credential harvesting attempt by directing users to external resources.

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.
  • 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 37 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://adsl-63-204-18-47.benefitplans.org/uploads/1/3/1/6/131606954/131606954.html#dsc+1616+user+guide
    • http://coppersite.com/uploads/1/3/1/4/131453793/sotigofom-ziwofo-jewol.pdf
    • http://skillblazers.com/uploads/1/3/1/3/131381546/8612645.pdf
    • http://eagletaxflorence.com/uploads/1/3/0/8/130874261/4414080.pdf
    • http://allisonlucchetti.com/uploads/1/3/0/7/130775646/lifazur.pdf
    • http://buckeyegriffin.com/uploads/1/3/0/8/130873973/melada_ladaf.pdf
    • http://bellagiavanna.com/uploads/1/3/0/6/130604309/ribijojejarape.pdf
    • http://aplpatra.com/uploads/1/3/1/4/131409135/5540381.pdf
    • http://velmacdevelopments.com/uploads/1/3/0/8/130814200/2091692.pdf
    • http://moving-is-easy.com/uploads/1/3/0/7/130739169/35f668003045bb5.pdf
    • http://morrowtimes.com/uploads/1/3/1/3/131383998/2213502.pdf
    • http://kootenaycured.com/uploads/1/3/0/2/130288893/7bce7b7f3dbac.pdf
    • http://alistoh.com/uploads/1/3/0/5/130588554/413592.pdf
    • http://ineslampreia.com/uploads/1/3/1/4/131453531/wekibuvuworipopi.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074f9.bin
58208bba649ce3c98d9d1d0e261d917ae3609016eb3a6b4a49d6b88d9d52559f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F9 5136 bytes

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