Malicious PDF — malware analysis report

Static analysis result for SHA-256 3937d130bc351534…

MALICIOUS

PDF

79.8 KB Created: 2021-03-24 02:37:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8bd094438d249f26ef19b39f24da1846 SHA-1: 447ecb76007b110ce10cce19fc1e9b9f7b645677 SHA-256: 3937d130bc351534a14b309614adb428215cc407bcbf37f0130b5fb8561f696d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting further malicious content. No scripts were extracted, but the structure points to an attempt to redirect users to potentially harmful sites.

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
  • 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://xezojetit.ru/wix?keyword=pond+snails+reproduction PDF link annotation
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/nunevunu.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/vukejunasenesikaro.pdfIn PDF document text
    • http://wordsidepost.top/31810785502tqhqc.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/623002.pdfIn PDF document text
    • http://kayikciakademi.com/mitaniwibud7ins2.pdfIn PDF document text
    • http://alsamcctv.com/febobexawezotevadoxufa9u8z.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/biblia_latinoamericana.pdfIn PDF document text
    • http://dom-bita.org/craftsman_19.2v_battery_charger_manualut0hy.pdfIn PDF document text
    • https://wawulawad.weebly.com/uploads/1/3/4/8/134872625/fazof.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/e71e1df8a50.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/6867684.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/63593877758.pdfIn PDF document text
    • https://pemifapizu.weebly.com/uploads/1/3/0/7/130776061/5f8387b371b.pdfIn PDF document text
    • https://wusoditada.weebly.com/uploads/1/3/1/4/131406121/zakofumu.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/3c49c.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/century_laminates_lookbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b9b0d702-4748-4dbf-82c3-9478f70762a0/what_are_the_components_of_a_data_warehouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6da9f0-cab2-4578-b3c3-07abae18a87f/game_of_life_conway_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9355d761-0dfa-44ba-8416-aedf0f61fdb1/what_type_of_bread_can_you_eat_on_a_low_fodmap_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde270eb-21af-44af-9e45-90d4f5a9ca4a/jinevemaxe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 4952 bytes
SHA-256: ba39e5908e1e179da9def61c7499ae129b2f0f75ad43ea2591feeb66745d0e35
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 10952 bytes
SHA-256: 1bd182e23600224b8be84a2f7d4d694b78215eee280a7b48d9d060cf0e20dd76
font_03_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2