Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb44d170b89dc90…

MALICIOUS

PDF

82.3 KB Created: 2021-05-03 19:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55930ac8b82e5b2071649d274972aa2 SHA-1: df352a978034c4ebe70b030bf74dec135995f18f SHA-256: ebb44d170b89dc90fb80db680d8b0206a17e106cd148967e4ed8ab2f9e97ad7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with a critical heuristic specifically flagging a mass of external PDF links. The primary malicious URLs identified are associated with this link farm, suggesting the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://jumiwimov.ru/strik?utm_term=is+project+x+lz+5.5+stiff
    • http://o-karte-kopilka.com/302322951286a15p.pdf
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/50861.pdf
    • http://xegazinijitup.mywebcommunity.org/bafg_formblatt_3.pdf
    • http://fupemagis.mywebcommunity.org/nigimejejazaladewuluror.pdf
    • http://usersonlineguardingsettings.site/97856348065swkvn.pdf
    • http://tosety.xyz/affiliate_marketing_guidejd1vp.pdf
    • http://tavegumata.sportsontheweb.net/singapore_math_grade_1_worksheets.pdf
    • http://damita.fun/solve_for_happyzr4nr.pdf
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/1742906.pdf
    • https://zulemogosisuwo.weebly.com/uploads/1/3/4/6/134689329/e010981b8b8.pdf
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/nalajani.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/19eda274e286d14.pdf
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/894f56b9748154e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_8d9cba1ec0ae41e18a4a6bcd824aa205.pdf?index=true
    • https://s3.amazonaws.com/rebesudanolo/3252530729.pdf
    • https://s3.amazonaws.com/megelugik/abcd_2_movie_3gp_video_song.pdf
    • http://nujilexulajuwup.atwebpages.com/logistic_regression_analysis_spss_interpretation.pdf
    • https://s3.amazonaws.com/wetevali/bitijosemomejag.pdf
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_ab9c1fcbaea745d182a264d3c65f7324.pdf?index=true
    • https://s3.amazonaws.com/lazesej/54062221600.pdf
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_6688bd300ae843e193706e261f9a1d6c.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/numark_ttusb_turntable_cover.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81f.bin
57870c4d3e8f4931657486a7f74bcc5de3531571f726bb78120c83e8f9ee6565
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 4768 bytes
font_01_sfnt_off00010882.bin
dbb808c452f883fcc33d0336ed1d483e2670ede96a07af99964c79923ec1419d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10980 bytes
font_02_sfnt_off00012da4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 4324 bytes