Malicious PDF — malware analysis report

Static analysis result for SHA-256 057f8a1911d3c07e…

MALICIOUS

PDF

46.5 KB Created: 2020-03-15 07:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c8abd56528a9b2e0acc4eddaf1d2f94 SHA-1: e87c745e7dcd81535effb9a84e0c913617002e63 SHA-256: 057f8a1911d3c07ebcefc85b54246e9cf9a8b59d789eb2a98452a0d37377cde4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a link farm or SEO abuse, embedding a large number of external URLs pointing to other PDF files hosted on seemingly unrelated domains. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a coordinated effort to distribute malicious content or redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely involving the delivery of further malware or phishing content.

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://feilvbinbaijialemianfeishiwan.br3h.com/uploads/1/3/0/3/130313590/130313590.html#google+sheets+filter+pivot+charts
    • http://extraordinarydocumentaries.com/uploads/1/3/0/7/130739631/xejonebajiw.pdf
    • http://simplyenhancingbeautylounge.com/uploads/1/3/0/4/130483302/nabozuzuxevi.pdf
    • http://minigolfgreens.com/uploads/1/3/0/6/130639814/02e66.pdf
    • http://www.stevenyasell.com/uploads/1/3/0/7/130775247/6211336.pdf
    • http://grimsbyfishmanufacturing.com/uploads/1/3/0/8/130813782/lerafoxaruxakokigin.pdf
    • http://garagedoorrepairhapalosverdesestatesca.com/uploads/1/3/0/6/130621721/depabage_vitofokevunifa_simobalewugot.pdf
    • http://shop.handmadebysewyellow.co.uk/uploads/1/3/0/8/130874161/juwutusi.pdf
    • http://www.tylergreenburyracing.com.au/uploads/1/3/0/4/130435755/dotiza-kutazuni-dufug.pdf
    • http://napervillecarpetclean.com/uploads/1/3/0/5/130539442/69a484.pdf
    • http://tenniscourtmanager.com/uploads/1/3/0/6/130604430/zomelepefamur.pdf
    • http://pizl.com/uploads/1/3/0/3/130324340/ziwomefovawirufo.pdf
    • http://messiniako-catering.com/uploads/1/3/0/6/130620679/ea7a9addbd7181f.pdf
    • http://swipebible.com/uploads/1/3/0/6/130621947/sudibate_xaruje.pdf
    • http://www.hannemanseafood.com/uploads/1/3/0/5/130539370/redawot-pobososin-remavobukezapev.pdf
    • http://etkruse.com/uploads/1/3/0/4/130476322/f46303b1a042d.pdf
    • http://regenerativemedicalsolution.com/uploads/1/3/0/8/130814179/5012199.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007735.bin
ef609fbb468f8d3f62179d59f8652e0600aa02219d6545397621ab484cc81d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7735 8264 bytes
font_01_sfnt_off0000971c.bin
550b323cd1655177c0030da0b210f3ff47bd2bbea4cd0b586290726ad65fa399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971C 16220 bytes

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