Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b5f7920c3a6386…

MALICIOUS

PDF

28.4 KB Created: 2020-04-12 02:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a034af1ea250615f5be653c1690e784 SHA-1: 1a881c608160c8ee12522f9354778238c2f3c5b9 SHA-256: 47b5f7920c3a63869597e4880aeefcbeae63a3e1ad21f70888decb0f36baa692
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to a technical manual solution, which is likely a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing the user to one of the numerous embedded URLs, which likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bejustalittlebetter.com/uploads/1/3/1/4/131453288/131453288.html#principios+y+calculos+basicos+de+la+ingenieria+quimica+himmelblau+solucionario
    • http://hector-armienta.com/uploads/1/3/0/4/130488839/4eef46.pdf
    • http://ruksookapap.com/uploads/1/3/0/2/130292098/cf6b194fa13f.pdf
    • http://mkebookscoach.com/uploads/1/3/0/5/130589309/5516934.pdf
    • http://petrolladies.be/uploads/1/3/0/6/130604091/wurap_repigisuzut.pdf
    • http://mountain-thoughts.com/uploads/1/3/0/7/130775200/sumulis-retobunugubap-tixikelek.pdf
    • http://dementiaenablingenvironments.com/uploads/1/3/0/4/130488445/669df90c1a510c1.pdf
    • http://katiekins.com/uploads/1/3/0/5/130550790/diguvorakifesiw.pdf
    • http://cerrovino.com/uploads/1/3/0/4/130488834/kofur_rubexujile_jafugobila_purovatigegakel.pdf
    • http://pittosporumgolfball.com/uploads/1/3/1/4/131483557/2ed4492da4fa7.pdf
    • http://carinbendas.com/uploads/1/3/0/5/130539188/bukunovamasilaguget.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_off0000499a.bin
637ee2e18d5816e8f4347039ee596dd1ecb8b47c3ca88c9432a4ac4976370f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x499A 7040 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.