Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39e9468f15623a3…

MALICIOUS

PDF

52.2 KB Created: 2020-04-16 20:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26cba7b2ee6291f51eddd11c8bc41325 SHA-1: 6b054df9354aecfa4537c63829bc2297765ca206 SHA-256: a39e9468f15623a39ea0b5d26342eda44fa05f16e41b4331bd8b5d3cd650de35
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on unrelated domains, suggesting a link farm or SEO abuse tactic. The primary lure appears to be an 'interview form word template' which redirects to a suspicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common delivery mechanism for malicious content.

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://mysoundcollective.com/uploads/1/3/1/4/131437627/131437627.html#interview+form+word+template
    • http://hollywoodjerseys.com/uploads/1/3/0/6/130622083/wukubadomon.pdf
    • http://gracewesleyanmartinsburgwv.org/uploads/1/3/1/3/131383255/c0ff324c.pdf
    • http://drjoelpearson.com/uploads/1/3/1/4/131438163/5963937.pdf
    • http://smartchitchat.com/uploads/1/3/0/6/130603889/nejusugav.pdf
    • http://mendbotanicals.com/uploads/1/3/0/4/130488091/1885338.pdf
    • http://offthewalanimalrescue.com/uploads/1/3/0/8/130874583/2526639.pdf
    • http://brainbodymindtherapy.com/uploads/1/3/0/6/130640235/vigopad.pdf
    • http://gandapasariboe.online/uploads/1/3/1/3/131380971/26f2bb9.pdf
    • http://thehoundog.ca/uploads/1/3/0/5/130547038/vefugipukufut_dixejofo.pdf
    • http://mkervra.com/uploads/1/3/0/7/130775786/wefipu_tesagem.pdf
    • http://kinarx.com/uploads/1/3/0/7/130775806/5061848.pdf
    • http://gaughanpsychkc.com/uploads/1/3/0/6/130621909/8d36ec8c1a.pdf
    • http://gaumukhtapovantrek.com/uploads/1/3/0/2/130270887/5918066.pdf
    • http://tuxrentalinnashua.com/uploads/1/3/0/5/130551202/pozarivatizu.pdf
    • http://tuxrentalinnashua.com/uploads/1/3/0/5/130551202/pozariva
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f2a.bin
810b42d99edeccb7b9844c815b3350684e3512c38ce86dc16f0d402c91cde2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2A 8308 bytes
font_01_sfnt_off0000af24.bin
0f23141ba94d37b49c53016ac63a9b008a6ac8e4c4656a8d80e6725f77750189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 16140 bytes

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