Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01816203a6bd1b8…

MALICIOUS

PDF

81.0 KB Created: 2021-03-22 06:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed2dfa945ebba78cc24bafec0c102f49 SHA-1: e483343b598505137ee75fc475235e96487ff8fe SHA-256: b01816203a6bd1b8a2a889fd6a095d1c81f25bf26c66f77eca1ff7be2e8f51fe
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of a malicious URL and ClamAV detection strongly indicates a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=tigerheart%2527s+shadow+pdf+free+download PDF link annotation
    • http://kefikajutadab.22web.org/15259425890.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/egfih9q/42767993017.pdfIn PDF document text
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/1869472.pdfIn PDF document text
    • http://faxoburoxiba.22web.org/the_situation_and_the_story.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/ffb00a.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/Fykhavg/super_school_driver_3d_mod_apk.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/efad152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_b9a9559219ad4f01a0dc48ede8d5c5b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b67072b-5d27-4914-8e5c-0575db2ad27f/the_game_plan_peyton_gets_sick.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/avanza_2011_type_g_manual_bandung.pdfIn PDF document text
    • http://wosoremozojofam.epizy.com/prioritisation_and_delegation_in_nursing.pdfIn PDF document text
    • http://sefudupufojuxo.rf.gd/13870418143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3a8aae-aea9-4691-a5bc-7c9f15dfcd79/71429029432.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/nz_fetal_doppler_guidelines.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_f919075c146045ec95d15b9b2d107060.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04df12b3-c977-4ab3-9f8c-ee2ef14c222c/41093273275.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c715053763d5472ba0567234ada3c701.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_0ead177a2a15444b8ed16d1b53ddbbf4.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_82a6e46cec7f4a04a9040875f05ab4ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/giwofamenogegewajewi.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_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 5376 bytes
SHA-256: 270ed3ebfb41a0c8d2e3421535512fb6c4afdc410f2ff2f5374802420122b204
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 10648 bytes
SHA-256: a22dc6c79f2671cf5e1119de1e48b406ed77deef8f523a05cf851ad6f1ea203b