Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cdd8947b8fad8d…

MALICIOUS

PDF

73.7 KB Created: 2021-03-05 18:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2bbeafce883b83abf902ceb38bd555da SHA-1: 3ff49bc817b6febd238ab42bdb18bcd095172bf5 SHA-256: a3cdd8947b8fad8de76eb7368fd528bf1155e248972aa2aed4b80880b07a11df
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, specifically designed to trick users into downloading a malicious application. The presence of a large number of external links, many pointing to disposable domains and SEO-optimized PDF files, strongly suggests a link farm intended to obscure the true malicious intent. The ClamAV detection and ML classifier further corroborate the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=game+duck+apk+latest+version PDF link annotation
    • https://cdn.sqhk.co/tazifawixax/00ieZvi/shooting_hoops_basketball_game.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/hbgj9ja/visivoponexaf.pdfIn PDF document text
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/9792098.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/fijidvx/roredikurig.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/V1whe8V/65210307365.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/4531379.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/hbaL1hg/messenger_kids_on_chromebook.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/2QSNfii/52459750118.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/jcihjeM/regal_cinema_movies_showtimes.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/c2jf5Vr/alienware_aurora_r11.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/48FiiA0/assessment_in_education_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ibBqYii/ant_simulation_3d_insect_survival_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/1gdghwP/new_word_games_online_free_scrabble.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/ckTgdAs/fireboy_and_watergirl_unblocked_elements.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/gDjeLgg/aaron_rodgers_contract_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_3570650164fc49f6aa2c1e224eb8a6e1.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_c0b193b98eec4dabb76be97457f98498.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_fda2c236e61f4a4f8ee4010f95688cb0.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_49ffc4e51c3d4b1fb0f94ea39003cb32.pdf?index=trueIn PDF document text
    • https://7382f664-3a3a-4b84-9c04-90301528964b.filesusr.com/ugd/4b68be_f32e3d128fff4478bfef033f514abaca.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 5376 bytes
SHA-256: 6d80dc76ec60e11d291cf38784a8b65529e45311b8c759cfdba9d2279622b88e
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 13460 bytes
SHA-256: c0666f65d30fc9c6071bd15a8d9824d37076095c3d52ce898f53ec2b8119bc32