Malicious PDF — malware analysis report

Static analysis result for SHA-256 4879d325dd1c6941…

MALICIOUS

PDF

45.8 KB Created: 2020-04-02 06:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5dfdc5dea2b13bcabbd41b972726e369 SHA-1: 2e30dbb9f1361a7a5afbe02d7919dd2d28357df1 SHA-256: 4879d325dd1c694133b68adfc0d26d374ba9351082a76c30ed1b407a4ffb7575
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text, though partially corrupted, suggests a lure related to a 'practical case study' for financial accounting. The primary heuristic indicates a 'PDF SEO Link Farm' which is a common technique to artificially inflate search engine rankings or distribute malicious content. The embedded URLs are likely intended to redirect users to malicious sites or download further payloads.

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://tcbucher.net/uploads/1/3/1/3/131380788/131380788.html#caso+practico+unidad+3+contabilidad+financiera+asturias PDF link annotation
    • http://nileinstitute.org/uploads/1/3/0/5/130547078/revusepubujojitej.pdfIn PDF document text
    • http://fcsoc.org/uploads/1/3/0/9/130969294/bumebige.pdfIn PDF document text
    • http://consciousmindset.org/uploads/1/3/0/4/130488974/d6e5586da575459.pdfIn PDF document text
    • http://viperfishmedia.net/uploads/1/3/0/2/130291712/2047544.pdfIn PDF document text
    • http://brainandb.one/uploads/1/3/0/9/130968934/f1ad5.pdfIn PDF document text
    • http://qualitynow.net/uploads/1/3/0/6/130621709/romebarijijobari.pdfIn PDF document text
    • http://fatheadevents.com/uploads/1/3/0/5/130588394/7446463.pdfIn PDF document text
    • http://shannonbarnettcbus.com/uploads/1/3/0/7/130775222/bd20be120c5a76e.pdfIn PDF document text
    • http://theonestopgaming.com/uploads/1/3/0/6/130620793/2888941.pdfIn PDF document text
    • http://rene-witt.xyz/uploads/1/3/0/7/130738956/zosoruxim.pdfIn PDF document text
    • http://friendsofsmschools.org/uploads/1/3/0/2/130272339/putason.pdfIn PDF document text
    • http://canadianly.com/uploads/1/3/0/6/130603683/nurujap_vazivamejijibez_jabisigojox_tuloguwugu.pdfIn PDF document text
    • http://dr-alice.com/uploads/1/3/0/5/130540788/luvoxisifel.pdfIn PDF document text
    • http://sweetassist.net/uploads/1/3/0/6/130639419/555314.pdfIn PDF document text
    • http://www.stixfonts.orghttp://www.micropress-inc.comAsIn PDF document text
    • http://www.stixfonts.org/user_license.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000723a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 9944 bytes
SHA-256: 89b4e10fa71b7ecba44a5e4ebf32aa1a9dd54d6136da94b991a35da7db3fd5e2
font_01_sfnt_off000095db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95DB 10532 bytes
SHA-256: 043f89cdc56a6d687dbde9ca708df5d68a479f0504edd5c2f1c61766139dec50

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