Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6504759c8ce462…

MALICIOUS

PDF

109.8 KB Created: 2021-04-23 02:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9d522e95febb83457d29022b1df9215a SHA-1: 0fc0f8b390c64111018818f9297927e7d831a63e SHA-256: 1b6504759c8ce462cc07742a78f2b04fa45b4a5764a95a64a1d41577ba881cf3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=the+other+side+of+the+mountain+book+afghanistan PDF link annotation
    • https://cdn.sqhk.co/zovitamojim/Drzighe/pixaradasimomalo.pdfIn PDF document text
    • http://rowokalasi.iblogger.org/82241670356.pdfIn PDF document text
    • https://kawutakupilim.weebly.com/uploads/1/3/4/2/134236314/durodinagokotiwug.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/the_investigators_of_arkham_horror_book.pdfIn PDF document text
    • https://rovalexi.weebly.com/uploads/1/3/4/5/134598456/e7b54.pdfIn PDF document text
    • http://savagaruzegiw.iblogger.org/ignatius_catholic_study_bible_old_testament.pdfIn PDF document text
    • https://zapufotipo.weebly.com/uploads/1/3/2/7/132740892/4729f2c53a3.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/jbjdBAT/repost_instagram_app_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/injjigZ/lamekubolanuj.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/ravenloft_bleak_house.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/b1ieRjg/tibegewakamamakekudirowi.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/fuvobuwu.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/2214502.pdfIn PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/marufi.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/3290360.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/74420379367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_d5f82a27269d4137858eb1f841b46895.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_72f051d5444e489498d77fc64bd1e6be.pdf?index=trueIn PDF document text
    • http://kakapefetabol.rf.gd/abby_fine_reader_free_full_version.pdfIn PDF document text
    • http://tuzevuvenadeg.rf.gd/power_bodybuilding_routine.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_24377a0f7f34489e97977498df1ff0ec.pdf?index=trueIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_f06c4a893fd0401aa3b949c5efbe69f7.pdf?index=trueIn PDF document text
    • http://ravuxigud.epizy.com/rokemura.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_off00016c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C31 5444 bytes
SHA-256: 5ceea27cb8402d378e8f60a3f015f831babb22bc51718f4b814044d81980d394
font_01_sfnt_off00017e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E82 12612 bytes
SHA-256: 335bc2e325b5f7d8b5d1e8c8fbb15e47d564de84b81a4acacca2035bf4b2bde8