Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f075c3072d7e0c8…

MALICIOUS

PDF

78.6 KB Created: 2021-03-07 11:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d64a0bbe3bf9c038ff1f618f1a15e093 SHA-1: ff10de85213797a96aa80e8fd99f9c665dd73269 SHA-256: 8f075c3072d7e0c8642bc0a230f6008045681bcc419f3a17a2d31c2301ea3a1b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL points to a resource related to 'idle heroes hack apk', indicating a lure for potentially malicious downloads or scams. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/wix?keyword=idle+heroes+hack+apk+1.19.0.p3 PDF link annotation
    • https://sizuzevejej.weebly.com/uploads/1/3/3/9/133997482/1371107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5fd912d894723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458163/normal_600203f0bf850.pdfIn PDF document text
    • http://parirapopuj.22web.org/67245989170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fc88f2259909.pdfIn PDF document text
    • http://zarepaputome.iblogger.org/47013204994.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/2375675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_60304083a17fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5fceb84566b3d.pdfIn PDF document text
    • https://jegolufu.weebly.com/uploads/1/3/4/6/134677495/3872617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382973/normal_5fc5db7173c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6035ececa207e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_5fd8f925284f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23657cef-4215-4af0-8ab7-e77cedbdddaf/23407815978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f272f5-7abb-4edb-bf13-60a2329d4288/parallel_lines_cut_by_a_transversal_identifying_angle_pairs_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1ed74e-55d9-4d14-aa17-a90b07ec7a76/jikodazatul.pdfIn PDF document text
    • http://boluwugotesuni.rf.gd/muker.pdfIn PDF document text
    • http://zomufebike.epizy.com/excel_lookup_function_from_another_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383a1d55-5485-4fa4-a84b-48ce50419c27/tisoladipidemirajiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13963a04-377f-410b-b82e-a50c2499713e/tutekiwavuvofunavaxenazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef41bed-2d30-46c0-a7c4-c6a88584d541/formato_para_presentar_el_plan_de_negocio_word.pdfIn PDF document text
    • http://samanoniminowut.epizy.com/91299292583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c8b723-c53d-4653-b08b-dc797d6f40a3/uppababy_vista_stroller_price.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_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 5708 bytes
SHA-256: 9f5213e4d7e744245311bdcc6a57afb2ab8df83bdf5c5104b96caeb2503bb527
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 10184 bytes
SHA-256: 54100410168fe5e9b59646b15755bbb607e4da7656458ecce40d25b7b5d95800