Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca484c29aa11e06…

MALICIOUS

PDF

40.7 KB Created: 2020-06-04 20:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1afbdce261414e7f8c75ee94b65a2e3d SHA-1: ba8010ed86601274c16644e58c93269be240457b SHA-256: dca484c29aa11e0654af70e2a5c116310db49f9716500674ca275dd0aa64c9dc
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of external links and the ML score suggest a malicious intent, likely to drive traffic or distribute further payloads.

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://allentrachtenberg-alife.com/uploads/1/3/1/8/131857598/131857598.html#sound+id+510+manual+pdf
    • http://thomasdfisherphotography.com/uploads/1/3/1/8/131856209/lojamirogedube_xafogezofuw_fubuwopujuda_bawamorokar.pdf
    • http://mantra2214.com/uploads/1/3/0/3/130313063/87b4799c0b2c.pdf
    • http://plsvirtual.com/uploads/1/3/0/4/130483860/dd040066d06.pdf
    • http://indrajuniper.com/uploads/1/3/0/6/130621127/pukabekadasanov.pdf
    • http://ekysports.com/uploads/1/3/1/4/131406892/roremufuvonomo-fegizesexun.pdf
    • http://gettingbetteratdoinggood.org/uploads/1/3/1/4/131438025/427ad8e1371c272.pdf
    • http://hostmaster.meine-apo.at/uploads/1/3/0/6/130639802/bolumugado.pdf
    • http://gaoerfuyulechengaomenduchang.br3h.com/uploads/1/3/0/4/130483565/69005e388a5c.pdf
    • http://autodiscover.groundfish.ca/uploads/1/3/0/3/130313366/1223301.pdf
    • http://northshoresmokeshop.com/uploads/1/3/1/4/131437792/8960735.pdf
    • http://allentrachtenberg-alife.com/uploads/1/3/1/8/131857598/terms.html
    • http://allentrachtenberg-alife.com/uploads/1/3/1/8/131857598/dmca.html
    • http://allentrachtenberg-alife.com/uploads/1/3/1/8/131857598/policy.html
    • https://regoliraniwo.files.wordpress.com/2020/06/17415216282.pdf
    • https://xomolabotev.files.wordpress.com/2020/06/36375284991.pdf
    • https://fuwikevon287342484.files.wordpress.com/2020/06/79382429260.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_off000074c9.bin
8235b9fe6c08dee22ac8c6adea260b374d80ec2a805b3ea543311970e41678b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C9 10076 bytes

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