Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e9f32ffcfbceb3…

MALICIOUS

PDF

54.7 KB Created: 2020-06-06 00:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 188ce662bba678b03ca1498d9ae38b84 SHA-1: d5e52a61ca593e8625788bfcc1b5dc9428464bc3 SHA-256: a1e9f32ffcfbceb3b8147a8c4eb4e3a9e0211cffc07eeb537c7af5f6e1cabe79
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 of which point to domains that appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to product names and the wkhtmltopdf tool, suggesting a lure to disguise malicious links. The primary attack pattern involves directing users to external sites, likely for further exploitation or credential harvesting.

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://icelandbeyond.co/uploads/1/3/0/7/130776255/130776255.html#porter+cable+pcb420sa+lowes
    • http://thelittlehousebyredesign.com/uploads/1/3/0/2/130292073/2c798ea0.pdf
    • http://boutiquefortysix.com/uploads/1/3/0/2/130289379/widelex.pdf
    • http://guttish.com/uploads/1/3/0/2/130288394/48811.pdf
    • http://fluentlanguageconsulting.com/uploads/1/3/0/8/130813616/7d32f8e39.pdf
    • http://pawsandclawspetcare.net/uploads/1/3/0/7/130738657/sifexu_gowuxovuzugade_piwosavepu.pdf
    • http://draculathetruth.com/uploads/1/3/0/8/130813967/porusen.pdf
    • http://webdisk.futurespresent.com/uploads/1/3/0/7/130776111/8366155.pdf
    • http://icelandbeyond.co/uploads/1/3/0/7/130776255/terms.html
    • http://icelandbeyond.co/uploads/1/3/0/7/130776255/dmca.html
    • http://icelandbeyond.co/uploads/1/3/0/7/130776255/policy.html
    • https://datarelozaw874436251.files.wordpress.com/2020/06/wasisalabefedilonulumud.pdf
    • https://kufixoku.files.wordpress.com/2020/06/76162362732.pdf
    • https://napokizi.files.wordpress.com/2020/06/40156499484.pdf
    • https://zenusunadaxo.files.wordpress.com/2020/06/18438122438.pdf
    • https://mofekimaxu.files.wordpress.com/2020/06/15433618286.pdf
    • https://remumalu.files.wordpress.com/2020/06/latufosurejapopolaxeles.pdf
    • https://livobaxuw793041599.files.wordpress.com/2020/06/51912438111.pdf
    • https://fajixolokaxe.files.wordpress.com/2020/06/29351125028.pdf
    • https://nigoruzi.files.wordpress.com/2020/06/96356079123.pdf
    • https://japifefig.files.wordpress.com/2020/06/ruxuvurapaxupesukus.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_off0000a9d2.bin
37c10c29b2024969e56b1782716610ba4848a5370b816cd0b88115e2864adb12
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D2 11216 bytes