Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6876af7a39190e…

MALICIOUS

PDF

77.8 KB Created: 2020-03-31 08:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ddb86f6062b8aaef1b8f54e8918c4791 SHA-1: 5bc67a6803d2c43b5c2b1a05d5516d56d9b96c3c SHA-256: 8a6876af7a39190efb82cd72ce5c9d80d2e16f9afdbde4620c68dc9ca11673d1
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to seemingly unrelated domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, preventing a deeper analysis of its specific intent beyond link distribution.

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://twistedsugarut.com/uploads/1/3/0/6/130621135/130621135.html#cressi+neon+dive+computer
    • http://indyfacepainters.com/uploads/1/3/0/6/130639965/nusemawalukuput.pdf
    • http://erevalue.com/uploads/1/3/1/0/131069819/707869.pdf
    • http://dailysfooddec.com/uploads/1/3/1/1/131163865/lowudujidilif.pdf
    • http://waterfrontescape.com/uploads/1/3/0/4/130483805/2875702.pdf
    • http://mylarkapparel.com/uploads/1/3/0/7/130740169/kipedo_fikimorukidabi_vijapovezugo_gujaxuji.pdf
    • http://daisyandchili.com/uploads/1/3/1/4/131438539/nabisitasorulevaj.pdf
    • http://hostmaster.crestdevon.co.uk/uploads/1/3/0/9/130969852/begot.pdf
    • http://advisorsonly.com/uploads/1/3/0/8/130814966/d998c7537c6.pdf
    • http://twistedsugarut.com/uploads/1/3/0/5/130551764/kurege_rafitu_pugifipes_davek.pdf
    • http://droncompany.pl/uploads/1/3/0/4/130435881/177a6e5b43fe771.pdf
    • http://cirquebonappetit.com/uploads/1/3/0/8/130813799/576496.pdf
    • http://imageone.us/uploads/1/3/0/3/130323214/970b8d08.pdf
    • http://ecowisescotland.org/uploads/1/3/0/6/130605040/kogamebamived.pdf
    • http://expresswaytoyrskullpdx.com/uploads/1/3/0/7/130738714/704689.pdf
    • http://thetbiportal.org/uploads/1/3/0/8/130874658/zezazufivugavomoxeni.pdf
    • http://limoservicehagerstown.com/uploads/1/3/0/7/130740513/8b854b52.pdf
    • http://behdaar.net/uploads/1/3/1/3/131380564/8961403.pdf
    • http://katherinegaulke.com/uploads/1/3/0/9/130969153/xemuxak.pdf
    • http://ominro.com/uploads/1/3/0/5/130539913/145a1b1622d922.pdf
    • http://bzdollars.com/uploads/1/3/0/4/130476684/284029.pdf
    • http://malaysia-tours.my/uploads/1/3/0/5/130544754/tusogejulup.pdf
    • http://tutoressex.com/uploads/1/3/0/7/130776312/1270410.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_off0001069b.bin
8637fd4f363a273d0d182ee2e5da46ba3f321084e42c349ec36c996bb85f90c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 8640 bytes

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