Malicious PDF — malware analysis report

Static analysis result for SHA-256 6205e7884addab44…

MALICIOUS

PDF

32.3 KB Created: 2020-05-18 13:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d36e151b1e8148572eccd4c27c76373 SHA-1: 762c9ec29528e39f6c709d50a9dcdc34ade32f31 SHA-256: 6205e7884addab444f10e7c5784689030233c5a5682ff847fb91a3a53a93bbdb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links to external PDF files, many of which appear to be algorithmically generated. The ML classifier strongly indicates maliciousness. The embedded links likely serve to redirect the user to malicious content or to host further stages of an attack. The document body's content, while partially obfuscated, suggests a lure related to obituaries, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ten11development.com/uploads/1/3/0/3/130379522/130379522.html#necrologie+republicain+lorrain+meurthe+et+moselle
    • http://lillyhouseofbeauty.com/uploads/1/3/0/5/130544232/kivelibinibebuni.pdf
    • http://datascimap.com/uploads/1/3/0/5/130540507/xekamapixanog-jenig-weduj-musolefefari.pdf
    • http://dc-agency.net/uploads/1/3/0/5/130544468/847ae9fb.pdf
    • http://plussizeweddingdressnewhampshire.com/uploads/1/3/0/2/130270777/relugubenapig.pdf
    • http://ladiesnightin.us/uploads/1/3/0/7/130738754/pujugajatik_rekukax.pdf
    • http://cshornets.com/uploads/1/3/0/7/130738615/a2cddf4bb.pdf
    • http://dessertwarsmiami.com/uploads/1/3/0/6/130620584/jokowimapuxogetes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000504a.bin
9c4c5b3af7eaa7c83f344a25c5feaf069f21b931212a8bd2f5985127ca5d4092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x504A 11608 bytes

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