Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2612051af42523…

MALICIOUS

PDF

76.1 KB Created: 2021-04-19 19:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d05b8df68e701a09846c2fa571f778e SHA-1: bd8f0cc24a9096266fdf587b0f6a862d2dcf3ba2 SHA-256: 4a2612051af42523883a1983296ef077afaf5fa2ecea9b4dbcf9cc36bc8f7f3c
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily corrupted, but the presence of 'Price of generac standby generator' suggests a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=price+of+generac+standby+generator In PDF document text
    • https://cdn.sqhk.co/jobiwokojo/ighifmb/burger_shop_maker.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/256515.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/nomobajuzuxub.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/sixanazabuvemodupax.pdfIn PDF document text
    • https://cdn.sqhk.co/liritefebat/lyl4fDc/ludozoxus.pdfIn PDF document text
    • http://ketadiets.site/new_headway_advanced_fourth_edition_answer_key89mhk.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/l5Ltieg/22405792940.pdfIn PDF document text
    • https://tadodilupusoje.weebly.com/uploads/1/3/4/7/134702012/e5c2afe32fef8d.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/4291740.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/xawewazevexuru.pdfIn PDF document text
    • http://atomyimperial.ru/showtime_rotisserie_cooking_times_tri_tipex76h.pdfIn PDF document text
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/5813752.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/8465084.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/21e88772-ad40-4cf4-839f-9da17fa01cfb/17668035486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a69065e-dbb4-4d5c-a490-ef47451baf02/duwulalitusareviju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b36df61-1f78-4d2b-99aa-40653c6ad904/danafelinaditewaresiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de802f2-01f2-4693-a03a-5e287f91d9c3/jinagisaxuxivivogogofados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c280de-0f7a-40dc-9e2e-d284a487340f/35804042815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19ab308-d7dc-45d3-b561-06382942f225/hoover_max_extract_77_not_spraying_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705b44d0-ff7e-4070-9702-69f69833adfa/how_to_program_suddenlink_remote_to_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91987b99-ca3c-4cce-a7ac-31ece5853a26/taco_bell_power_bowl_nutrition_no_rice_no_beans.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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 5400 bytes
SHA-256: 7073edf393f5af401a01766dbd3b9cb45f1303f9cd3ac4b95d5adebaab8e9041
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 10412 bytes
SHA-256: a09c4c54a32e297b860b7ad4710ace49fa95f5f16f3f341a8f6be546e8dd0dbb