Malicious PDF — malware analysis report

Static analysis result for SHA-256 9761cc170f279788…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 07:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 64b5b72479713cc01bb57d40f9cf25a9 SHA-1: 22d6cf3b65e61478eb4e76e8f202be60def2371e SHA-256: 9761cc170f27978826bed5f20d425600ac1425d4469ec721483a1ee127553b79
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. While no scripts were directly extracted, the structure and link farm suggest an attempt to exploit users through indirect means, potentially involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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/123?utm_term=cheeni+kum+full+movie+free++hd In PDF document text
    • https://cdn.sqhk.co/wixexozesila/hghfjbS/download_souzasim_drag_race_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/ijhihcI/tazijelatev.pdfIn PDF document text
    • http://donbetosstreettacos.com/20701843310e0boq.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/bhartiya_samvidhan_kalam_in_marathi.pdfIn PDF document text
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/medemetuzexiwib.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/chckYZC/xukejawubesetagemili.pdfIn PDF document text
    • http://mini-cam1.club/game_champions_manager_mobasaka_mod_apkl08a0.pdfIn PDF document text
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/63b71f42.pdfIn PDF document text
    • http://micrometer25bill.site/juxefos7cx04.pdfIn PDF document text
    • http://hookup153.fun/cinebox_series_remote_control_apk0jg3b.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/jcFaL5o/best_7_minute_workout_app_android.pdfIn PDF document text
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/2970bbe8aa.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/bGnLWu4/44290619311.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/fidakov.pdfIn PDF document text
    • http://yatvoyya.fun/48953343812bzvco.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://betugoxutufaf.epizy.com/kenmore_front_load_washer_error_codes_oe.pdfIn PDF document text
    • http://sodanone.rf.gd/41985576864.pdfIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_a79ff7d063c547a1b7d746fb1149ec26.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_c0e65cd131e1413589dd634261b6979e.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_bd12aa45423d4b4188909c7dee1add4f.pdf?index=trueIn PDF document text
    • http://gogotefabup.rf.gd/zenorasotaverosijaj.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/dell_optiplex_9020_sff_motherboard_size.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 4708 bytes
SHA-256: bd7086a09402d44c9319fdc2803005c3f60bf0e08d5c507eb019d0dae5a04fb9
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 11600 bytes
SHA-256: 1e39676e02ab4ead1f454227776d4b032b67ae497c6cf39dc21791b444cae3c7
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146
font_03_sfnt_off000133c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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