Malicious PDF — malware analysis report

Static analysis result for SHA-256 183329302b1163a3…

MALICIOUS

PDF

35.7 KB Created: 2020-03-21 15:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c42716a8e171f4206c0b49eb35ea79c8 SHA-1: a94ba3b685d94a134536433b3002ff19201e1cc4 SHA-256: 183329302b1163a30e5bb030dc8b14d57170d27a5dd8bc0b137c117cde218c99
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious or spam-related content through these embedded links.

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://ecuadorenruta.com/uploads/1/3/0/6/130639861/130639861.html#alabanza+a+tus+pies+de+miel+san+marcos
    • http://nakedroots1.com/uploads/1/3/0/3/130323411/7a5844ce459c.pdf
    • http://www.theprofessor.co/uploads/1/3/1/0/131070526/pomixedoremeba-bebofobikawav-tuxopaladudevow-jadiwik.pdf
    • http://www.ryansbakery.shop/uploads/1/3/0/6/130604635/7945907.pdf
    • http://badbatfilms.com/uploads/1/3/0/7/130739240/rukorolatixo-pusudeban-jotexef-pukewilefer.pdf
    • http://villagewoodonline.com/uploads/1/3/0/4/130435833/moguwowubeza.pdf
    • http://rrhsartclub.com/uploads/1/3/0/4/130483981/fikezufiwe_kumewikepod_mupirib_xabisapov.pdf
    • http://mail.constructivistpsych.org/uploads/1/3/0/7/130775598/tilufedikegosubit.pdf
    • http://monarchlax.com/uploads/1/3/0/7/130739962/fuxapemoxofedo.pdf
    • http://duocaiqiliyulechengzhenqiandubo.f18.ebkf.org/uploads/1/3/1/0/131069970/kefukodanaba.pdf
    • http://aphy.org/uploads/1/3/1/0/131070332/532551ea.pdf
    • http://drlyons.net/uploads/1/3/0/5/130544751/3478192.pdf
    • http://midnightentertainmentgroup.com/uploads/1/3/0/2/130270847/jujupuni_nalasi_kavujikakoje_xofabov.pdf
    • http://mytreasuredmomemnts.com/uploads/1/3/0/9/130969568/wevipowul-goniset-jamojebava.pdf
    • http://www.ajtve.com/uploads/1/3/0/8/130813577/dejufinux.pdf
    • http://xxxcrew.com/uploads/1/3/0/6/130605462/mifevifinogiki.pdf
    • http://gacimba.com/uploads/1/3/0/8/130873852/9747316.pdf
    • http://heszimbabwe.org/uploads/1/3/0/5/130542822/nusakusewi.pdf
    • http://alt.heffernansheating.com.au/uploads/1/3/0/7/130738700/8994942.pdf
    • http://rootedsuds.com/uploads/1/3/0/2/130274088/niwikatuke.pdf
    • http://gillinghamtravelltd.com/uploads/1/3/0/7/130775413/pubizumoloval.pdf
    • http://mail.tanyankee.org/uploads/1/3/0/6/130620609/58a5bb28.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_off00005f3a.bin
db5b78c61242ea94db9a806008a9eb7c3affc8c8e3355dfc4f3636717445cf12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3A 9052 bytes

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