Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1c8972a901334d…

MALICIOUS

PDF

44.8 KB Created: 2020-04-07 12:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26346666e98316e81d78f111b1af04a7 SHA-1: 783eb2039c5e7a1a1582d092be1062be2c24df7d SHA-256: 7b1c8972a901334d81f3c9aa19cc458685e552c2904837c32fe8c4bd5c79b725
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The document body text appears to be obfuscated or corrupted, but the embedded URLs are clear indicators of malicious intent.

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://queenbellasworld.org/uploads/1/3/0/6/130639931/130639931.html#ejercicios+resueltos+de+diagrama+de+pert+cpm
    • http://graffitigreek.com/uploads/1/3/1/4/131406895/9616463.pdf
    • http://marybellesboutiquecom.com/uploads/1/3/0/8/130874495/gozufowaxul.pdf
    • http://alpurpletaxi.com/uploads/1/3/0/5/130588729/1351119.pdf
    • http://beingwithcounsellinglondon.com/uploads/1/3/0/6/130621803/purusil-finasajerapoz.pdf
    • http://haroldhowell.com/uploads/1/3/0/7/130739607/baguzovajaziluf.pdf
    • http://ascendbike.com/uploads/1/3/1/4/131454580/nejamebazefitan.pdf
    • http://teamblackdragon.com/uploads/1/3/0/8/130813528/zasoxikemopig.pdf
    • http://salescup.net/uploads/1/3/1/4/131452972/fukotos.pdf
    • http://carlybullphysio.com/uploads/1/3/0/9/130969389/6713126.pdf
    • http://scaleupentrepreneur.com/uploads/1/3/0/3/130324011/konawatasodixovukola.pdf
    • http://joshuahockley.com/uploads/1/3/0/8/130873923/kavewoduxila.pdf
    • http://westyswood.net/uploads/1/3/1/1/131164211/wofujojiwofewo.pdf
    • http://valueaddedpainting.com/uploads/1/3/1/0/131070938/858c2bf443db.pdf
    • http://northboundcanine.com/uploads/1/3/0/8/130814032/gumopew.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_off000082d0.bin
4047682c0a5defc970108bec5910b69adc11a599346df31b92328177adb459a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D0 9284 bytes

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