Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea3952c83b45c9f…

MALICIOUS

PDF

44.2 KB Created: 2020-04-25 18:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9600439e44be0c3a202cfedaaa6337e SHA-1: ec0d0744d81607a7ffd310901972e2c26617061a SHA-256: dea3952c83b45c9f976915c3ecb0b37922bf1cc6b16b485c89e798a0a7f346f6
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm for SEO manipulation. One of the embedded URLs is "http://app-pof.com/uploads/1/3/0/3/130379222/130379222.html#manual+blood+pressure+cuff+how+to+use", which is presented as a manual but likely serves as a lure to a malicious site. No scripts were extracted from this sample.

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://app-pof.com/uploads/1/3/0/3/130379222/130379222.html#manual+blood+pressure+cuff+how+to+use
    • http://trailerrepairrichmond.com/uploads/1/3/0/7/130738796/dibuginebuvari-rowezerozorif-zikenem-gumuzo.pdf
    • http://suzannedreher.com/uploads/1/3/0/4/130435661/tutibolojibali.pdf
    • http://gentlemansboutiqueny.com/uploads/1/3/1/1/131163760/c8f58.pdf
    • http://mceducationconsultant.com/uploads/1/3/0/6/130621765/771a0839cb4.pdf
    • http://pdxgaslinesllc.com/uploads/1/3/0/6/130604780/6288769.pdf
    • http://lowenberger.com/uploads/1/3/1/3/131383681/8b016dc1ba7586c.pdf
    • http://bikkietin.com/uploads/1/3/1/3/131380347/napekugotoxuz.pdf
    • http://station55bar.com/uploads/1/3/0/8/130813779/domufogavawuluzel.pdf
    • http://sonja-waldecker.de/uploads/1/3/1/3/131380343/4830489.pdf
    • http://crowleyvisioncare.net/uploads/1/3/0/7/130776142/nudafapejuxa.pdf
    • http://motors-vpp.com/uploads/1/3/1/0/131070761/6495437.pdf
    • http://luxenglow.com/uploads/1/3/1/0/131070226/ec0828a531.pdf
    • http://thecrystalsisters.com/uploads/1/3/0/7/130775756/3987673.pdf
    • http://compresucasa.com/uploads/1/3/0/5/130545249/6302756.pdf
    • http://plevsurevilleumc.com/uploads/1/3/0/2/130271205/e11ac414db7410.pdf
    • http://bikkietin.com/uploads/1/3/1/3/131380347/napekugotoxuz.p
    • 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_off000084ae.bin
d25845a4f6b99236a349cf81f8606ba3e5b878ce981b3133b701aa17a657ad61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 8148 bytes

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