Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15610c744da833e…

MALICIOUS

PDF

70.1 KB Created: 2021-04-14 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a74bc6df3f2d3dc479bd7209586a3bc SHA-1: 3e25f578789aab3b2d9056012c7b513724c62716 SHA-256: a15610c744da833e46eb9a4ba65b59e2364d280fe769b80c43c26eb5d3bdfd78
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=danby+10000+btu+portable+air+conditioner+with+dehumidifier PDF link annotation
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/51e2e902963d4.pdfIn PDF document text
    • http://zasaluto.iblogger.org/cinderella_2006_movie.pdfIn PDF document text
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/ea1db.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/zimojuvi-tirapeje-puzopevelu-paguzavogefurok.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/d94d3fcdafaf4c6.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/55801.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/vukakuwox.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/lesekagufetajom-xakaruliwes-gejosomeleje-vetoguzefifera.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/6548644606.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/zerelide-valosirejoloj-pawodepovaninow.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/ifW8hjp/download_game_stick_of_titan_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/fWP7ihl/41820825196.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/Xggl5Gv/fall_guys_guide_free_ps4.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/jujor-xeramasemugus-vululagifopitop.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/ig2Oic4/disney_movies_anywhere_app_download.pdfIn PDF document text
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/gazalotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://motamapu.rf.gd/happy_birthday_photo_app.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/what_does_the_color_dark_purple_mean_in_a_dream.pdfIn PDF document text
    • http://datatoxozapi.epizy.com/memu_android_emulator_for_pc_windows_10.pdfIn PDF document text
    • http://vuregaxin.rf.gd/gujaravidewogozabazo.pdfIn PDF document text
    • http://denotepisijolib.rf.gd/wepedut.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 5744 bytes
SHA-256: 4bc8812dee097276910b566f65eb7ddd804d146ba67678c2497d49583afb96c2
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10308 bytes
SHA-256: fc0d45580ef97faefa8e80a548c8ba3cc5ea48c9053028c161c7dd0d61ca2702