Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef67c67c5bfbd2d…

MALICIOUS

PDF

63.0 KB Created: 2020-03-20 04:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc09210464044b39f25e7e0e498919fe SHA-1: 40ac0024388db579ed6d8d732b8bd9928ce022e2 SHA-256: cef67c67c5bfbd2dfff76581d0e337738316c98ee58ce719ef5de99c76a9a704
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains URLs that are part of this link farm. The primary function appears to be directing users to a network of external PDF files, likely for SEO spam or to host further malicious content.

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://wickedslushukiah.com/uploads/1/3/1/0/131070389/131070389.html#the+scorpion+king+book+of+souls+synopsis
    • http://www.foreveraloecanada.com/uploads/1/3/0/5/130551746/4394425.pdf
    • http://myeneeproject.com/uploads/1/3/0/5/130551943/7394030.pdf
    • http://groupofhope.com/uploads/1/3/0/2/130272586/zevezenewiger-pinere.pdf
    • http://simplyexquisitehg.com/uploads/1/3/0/4/130489275/telisovogeju.pdf
    • http://evilpiggie.com/uploads/1/3/0/5/130588762/4757840.pdf
    • http://resines.info/uploads/1/3/0/5/130550655/bigezatek.pdf
    • http://mastercleanservice.org/uploads/1/3/0/6/130621132/vilowik-jekusolod-zabubagezafabaf-wosokobujifesu.pdf
    • http://webdisk.fairwaymemorial.com/uploads/1/3/0/3/130313105/juruvogoxuxaru.pdf
    • http://canniny.com/uploads/1/3/0/5/130543467/1308260.pdf
    • http://www.naturallybeautifuletc.com/uploads/1/3/0/6/130639635/80b3a1d0d8fd09d.pdf
    • http://mcfarms.eu/uploads/1/3/0/7/130739495/warupebu.pdf
    • http://lowermanhattanparents.net/uploads/1/3/0/4/130488322/gexesifule.pdf
    • http://test.maurermobileblasting.com/uploads/1/3/0/3/130313208/gukebipum_vewip_wewib.pdf
    • http://drewmichaelpga.com/uploads/1/3/0/6/130620963/dupezevij_pusivig_xusalub_kiletepotat.pdf
    • http://tryharvest.com/uploads/1/3/0/2/130289773/c9eeda7.pdf
    • http://super-lover.net/uploads/1/3/0/8/130814984/115921.pdf
    • http://ceceliablenkerart.com/uploads/1/3/0/7/130739129/bulalak.pdf
    • http://www.zonawear.shop/uploads/1/3/0/8/130873915/belajotasak_tekapipa_fagakalojur.pdf
    • http://applepickndays.com/uploads/1/3/0/2/130273578/wegupisowux_kepipor_tesesanazixo_zizuxupam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c106.bin
28dadb9f9fb6422c34e1eb21a772e22199d85bffcf9f4fc12ac90dfc79c3ab81
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC106 24020 bytes
font_00_sfnt_off00009ce4.bin
9d8eccac769c78f113d17b477ad1005228bddcf01be5b022c841122d11d21e56
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE4 10352 bytes