Malicious PDF — malware analysis report

Static analysis result for SHA-256 3740e142c20bdd29…

MALICIOUS

PDF

72.8 KB Created: 2021-05-04 00:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 861bf7a09bd4f7a3bcf61dd5bca49df4 SHA-1: 21855a1764ec7d2be37346da129d565bdd6ca6cd SHA-256: 3740e142c20bdd298c07300014a7777c2c770a178b46ad6bb53874779193088e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference manga and software, likely as a lure. The presence of multiple links to disposable hosting and the ML classifier's high confidence score further support a malicious intent to redirect users to potentially harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=crookedstar%2527s+promise+manga In PDF document text
    • http://jaxifas.getenjoyment.net/fahrenheit_451_annotations.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/beautiful_in_white_violin_sheet_music.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/staff_appraisal_format.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/gibhaib/zinosunozonowek.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/cghbDhi/zombies_board_game_twilight_creations.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/g7lgfiD/is_frndly_tv_on_apple_tv.pdfIn PDF document text
    • http://visekuturit.iblogger.org/89298354006.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/grade_10_algebra_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/wasusoguba/c9ifhin/86927561766.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/canon_430ex_ii_zoom_not_working.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/bogif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/pipinu.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/magneto_abrasive_flow_machining.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/62870040107.pdfIn PDF document text
    • http://tavupikegoseri.epizy.com/cinema_box_app_apk.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/google_chrome_web_to.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/nudikubafovafogigi.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/wivagajisurigelumopilob.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/bestway_cement_annual_report_2020.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 5252 bytes
SHA-256: 9da68987237e77020f6a69babe0ebd71cd3257516bbd95d2160300d1def4b3f3
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 10596 bytes
SHA-256: a71dd4be6dab5bb3619302741a2b088ce9e5419c2f167c06d84d1b667faca280

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