Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bc4426bed262b6…

MALICIOUS

PDF

37.4 KB Created: 2020-05-01 07:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f676b6e2233c9ee202a708aabde43010 SHA-1: 1b8646a98efa6e62230f4de6391aa1aad9278305 SHA-256: 46bc4426bed262b63fecf8722c7a5e766c1055ea13ef90debae733e734c78adc
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to other PDF files hosted on various domains. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a deliberate attempt to create a network of linked content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://nationalfootballcheerleadersalumni.org/uploads/1/3/1/4/131437094/131437094.html#input+file+accept+pdf+and+image
    • http://southwestwellnesstraining.com/uploads/1/3/0/7/130775115/degunejabugimarotoda.pdf
    • http://ijoymall.com/uploads/1/3/0/7/130775186/pibubunoba.pdf
    • http://bowriverflyfishguide.com/uploads/1/3/0/6/130604313/a00c4b3e.pdf
    • http://homefirstconstruction.com/uploads/1/3/1/4/131452961/146c8e.pdf
    • http://advancedmetalsigns.com/uploads/1/3/0/6/130620957/2da0510fd30.pdf
    • http://garyfleckminerals.com/uploads/1/3/1/0/131071057/jimitonena.pdf
    • http://stichtingpopmuziekthorn.nl/uploads/1/3/1/4/131406811/3326909.pdf
    • http://beautymassageonlinetraining.com/uploads/1/3/0/8/130814859/fobeta_subelika_bajuxe_nizuniteraxiv.pdf
    • http://chopsticksmine.com/uploads/1/3/1/3/131382030/610767.pdf
    • http://heatherboreske.com/uploads/1/3/0/5/130539403/pavob-luluribame-dibum.pdf
    • http://thelanterngroup.org/uploads/1/3/0/5/130588977/1934127.pdf
    • http://jillskupinburkholder.com/uploads/1/3/0/5/130544226/pixujagunip-segowilemitatap-mefojova.pdf
    • http://languagelosangeles.com/uploads/1/3/0/5/130545484/zalikenor_vojekovum_faduxejorim.pdf
    • http://fitcoresmartmoves.com/uploads/1/3/0/6/130621583/kamexiwomulosi.pdf
    • http://ndissupportworker.com/uploads/1/3/0/7/130739492/xifevolatu.pdf
    • http://millerscustomstitches.com/uploads/1/3/0/6/130621719/suvorivelan.pdf
    • http://norilsknickellogistics.nl/uploads/1/3/0/4/130476368/vonijax_sugigofulewofex.pdf
    • http://ganjagoddess.tv/uploads/1/3/1/4/131438155/paxovazoxi_samiboka.pdf
    • http://odigoleaders.com/uploads/1/3/1/4/131438127/1335569.pdf
    • http://amazeincorporated.com/uploads/1/3/0/9/130969957/fotorulojumefate.pdf
    • http://keynoteadmin.net/uploads/1/3/0/6/130621490/daledaxejugujaw.pdf
    • http://skyzthelimitdrones.com/uploads/1/3/0/9/130969700/9721172.pdf
    • http://mymobilephysio.com/uploads/1/3/1/0/131071021/223fd8572.pdf
    • http://journeykouture.com/uploads/1/3/1/4/131406797/7399158.pdf
    • http://ganjagoddess.tv/uploads/1/3/1/4/13
    • 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_off000064dc.bin
27f5b94ce7b70cb8ad9ae06cc8506dc717be5a9e039e7c11d0597b989477f2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DC 9504 bytes

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