Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd4ca23850b4f13…

MALICIOUS

PDF

36.7 KB Created: 2020-04-03 13:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 55619a54154ac8c1346200988bdc4b67 SHA-1: 198dee93fe7f13be18fdf5a3640961ea1850a380 SHA-256: 5dd4ca23850b4f1397d842bfefd8f5707807050bc533e3906d524206cce28d9d
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 point to other PDF files hosted on similar domains. This pattern is indicative of a link farm used for SEO poisoning or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are likely intended to redirect users to malicious sites or download further payloads.

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://adventuredanang.com/uploads/1/3/0/3/130312950/130312950.html#little+house+on+the+prairie+series+order
    • http://rjsdiner.org/uploads/1/3/0/5/130550826/feacfe49.pdf
    • http://redfernwineclub.com/uploads/1/3/0/6/130620731/1363781.pdf
    • http://mollydooling.com/uploads/1/3/0/7/130739023/2084963.pdf
    • http://dizignsign.com/uploads/1/3/0/2/130288316/f5678bc.pdf
    • http://robertsbusinesstalk.com/uploads/1/3/0/7/130739224/pikixagapepexor_zixesiri_sigomagafin_zisulamotupakok.pdf
    • http://mineshaftgems.com/uploads/1/3/0/9/130969432/8982979.pdf
    • http://communityactionthroughsportsandeducation.com/uploads/1/3/0/5/130543476/nudedugonif.pdf
    • http://conceptionmd.ca/uploads/1/3/0/6/130621215/9545039.pdf
    • http://seathruproinspection.com/uploads/1/3/0/5/130588672/08397935667135.pdf
    • http://aclimited.org/uploads/1/3/0/7/130740050/4871408.pdf
    • http://divinestagingandredesign.net/uploads/1/3/0/7/130775223/3892fbe8fb344.pdf
    • http://todaycounts.org/uploads/1/3/0/8/130873937/vutogowupox.pdf
    • http://avedaluzern.com/uploads/1/3/0/8/130874066/soriwunutefeb_buluvu.pdf
    • http://mpprod.fr/uploads/1/3/0/4/130475918/ae86875.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_off000068b7.bin
a3ebed223cc4c42273eea4c0d3c92a0ecd4ea41cc7f6f2211001531cb6c71e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B7 7328 bytes

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