Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ff04a010948411…

MALICIOUS

PDF

44.9 KB Created: 2020-04-03 07:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2a62c2b4611a62edc03ab6de6678636 SHA-1: 3d678390749b27f1d5ee6811a81a6b17520c8df3 SHA-256: d3ff04a0109484111b7c7bc878556fb1830fe2b3ae6eba44090ade419bf3845a
94 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external links to other PDF documents. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, likely intended to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

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://reec.cc/uploads/1/3/0/7/130776046/130776046.html#ejercicios+de+vectores+en+el+plano+resueltos+pdf
    • http://ps5grip.com/uploads/1/3/1/4/131438709/sanakidujejiw.pdf
    • http://myglamvolt.com/uploads/1/3/0/6/130639226/zinawunigox-duwibaxala-vigixesekadufog-wadugonok.pdf
    • http://georgealex.com/uploads/1/3/0/8/130814596/tirafexix.pdf
    • http://cutevsevil.com/uploads/1/3/0/5/130550775/a69694cfd.pdf
    • http://easycarssale.com/uploads/1/3/0/7/130740456/madomuva.pdf
    • http://theaustraliancraftdrinkscompany.net/uploads/1/3/0/2/130288909/917052.pdf
    • http://acculawnmpls.com/uploads/1/3/0/6/130639305/diwarasepimon-tagofono-dasugewad.pdf
    • http://adsl-64-123-229-204.allenfinancialcorp.com/uploads/1/3/1/3/131398076/femadegu-xetine-kulomugixoru-vojofule.pdf
    • http://happyconezllc.com/uploads/1/3/0/2/130292143/3be00a6f.pdf
    • http://proudsmokers.com/uploads/1/3/0/6/130621460/xajenuzekoxew-tiduzujewurabap-burobopojifote-wosureziru.pdf
    • http://heirloomwearyourart.com/uploads/1/3/0/8/130813483/sijow.pdf
    • http://specialtycoaching.net/uploads/1/3/0/5/130589102/jubotit.pdf
    • http://newenglandsunroomrepair.com/uploads/1/3/1/3/131379958/saxilikojuf-turuvunivuzud.pdf
    • http://isabellecharbonnet.com/uploads/1/3/0/4/130478057/470130.pdf
    • http://addieprayse.com/uploads/1/3/0/8/130874683/zosabelewo.pdf
    • http://kkmedicalsharingservices.net/uploads/1/3/0/7/130738946/8bf966274483.pdf
    • http://azcatalyst.org/uploads/1/3/0/8/130874340/vikawefutagi-xunemizep.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_off000082da.bin
e616c85204ef70bed000d9fe43a2c125527bc3958a73498bd7b2d282721e4044
pdf-font-stream PDF embedded font (sfnt) at offset 0x82DA 9612 bytes