Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b1b2c661215d4c…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 23:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 765991c8b948f7c1c63da2a2f9c8e3a7 SHA-1: ef5023df361c41dff267a62d4457355d06303dd4 SHA-256: 22b1b2c661215d4c21a871e3ac07ab13fca28491830c0537ba249b4e47475b41
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a "chess application for pc", likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/123?utm_term=chess+application++for+pc PDF link annotation
    • http://sunazeremitiwu.mypressonline.com/un_behindertenrechtskonvention_englisch.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/59870762494.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/zurenigewuvukomelobewim.pdfIn PDF document text
    • https://cdn.sqhk.co/xabovalizo/DjhZNif/bubble_mania_cheats.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/arriscando_a_prpria_pele.pdfIn PDF document text
    • http://golden-bridge.pro/ansible_2._8_documentationstv9k.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/NgjghyL/53529619972.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/iOPnDrw/ev3_multiplayer_drag_racing_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_606c077e45e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_602663eddd3bc.pdfIn PDF document text
    • http://wide-mean.top/pewarolakatea3vfm.pdfIn PDF document text
    • http://getchambre.xyz/behen_hogi_teri_movie_480p1by0q.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/84573857012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_e09d7b14fb2b4502ae6b56a74dfded09.pdf?index=trueIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_89129f2fc02e42ebba05daa7c23bdf44.pdf?index=trueIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_08f6646dff85435c911b9af7b6f805e0.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_050261275767425f96b6d9937662ea39.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_3a090da70c6249d483566c9188e1c4e4.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/dd_beyond_monsters_list.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5008 bytes
SHA-256: c6b1864e5729579d30d720c27b1197bbeafd1d1ab4000acf0c605eca902ba8e9
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10896 bytes
SHA-256: 2b11945337c87b7ca3c87890adaac388149b67261cfa6bdc5d592d3633f10b3e

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