Malicious PDF — malware analysis report

Static analysis result for SHA-256 5436bd22c9388707…

MALICIOUS

PDF

38.1 KB Created: 2020-04-15 12:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12f25dd90fa79a815e472115b1236076 SHA-1: 8887524bd6d673648e9634644195f78180fd9613 SHA-256: 5436bd22c9388707be7926f87bc8318679c790ad73bac62fe58c4f2444f4b897
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO spam tactic. The document body text, though partially corrupted, mentions 'Screen capture from video android', which is likely a lure to direct users to malicious websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://weddingweightlossspecialist.com/uploads/1/3/1/3/131381521/131381521.html#screen+capture+from+video+android
    • http://throwthehammer.com/uploads/1/3/0/8/130874051/rureji.pdf
    • http://yeadong.com/uploads/1/3/0/5/130541846/xonepewinurizirome.pdf
    • http://banklocal.org/uploads/1/3/0/7/130775921/5486100.pdf
    • http://kinkiosk.com/uploads/1/3/1/4/131409135/2132490.pdf
    • http://localhalalcuisines.com/uploads/1/3/1/3/131381048/7365553.pdf
    • http://shoprivercityapparel.com/uploads/1/3/0/6/130640141/rawojajizakijugibiku.pdf
    • http://sirbrutus.com/uploads/1/3/0/6/130639800/jejejedonaru-desoxi.pdf
    • http://tempusproducts.net/uploads/1/3/0/2/130272286/jafotipefibosunef.pdf
    • http://afrikawase.com/uploads/1/3/0/6/130605505/labudosirejexufexoba.pdf
    • http://thaochibi.com/uploads/1/3/0/2/130287553/gejipupowe.pdf
    • http://thejayebrand.com/uploads/1/3/0/7/130776174/fadijisugubatuma.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_off00006d06.bin
665f45e6b24b48af3ceffcf7fb809f4317d3d4e7b9e164f25aaf3752b0a67ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D06 8064 bytes

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