Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f48ddb93d6106a6…

MALICIOUS

PDF

76.1 KB Created: 2021-05-22 03:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 072ac3275d2845ae0bf7ff39f10900f6 SHA-1: de4acf5ea878cf60ef521590efb2d7226a3487e8 SHA-256: 4f48ddb93d6106a65dd7f1dc0efb7fcc44ab444cd949d12cc874f941ae009117
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=who+can+complete+a+legionella+risk+assessment PDF link annotation
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/fasaxopamigagar-zatijezulojad-nobelabipewowuf-gebajejagoda.pdfIn PDF document text
    • https://denapifikuzo.weebly.com/uploads/1/3/4/6/134634031/5101090.pdfIn PDF document text
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/xezavaru.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/cc5f1b9114802e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_605d934a18678.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/2b3695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fe4f258c9cad.pdfIn PDF document text
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/9440580.pdfIn PDF document text
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/4610467.pdfIn PDF document text
    • https://tuxaxigete.weebly.com/uploads/1/3/5/3/135324810/pipidanetutuzuropate.pdfIn PDF document text
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/lomirumasupowiralex.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/bafupedivojunuvavol.pdfIn PDF document text
    • https://bofakodejo.weebly.com/uploads/1/3/4/2/134265658/ef3a622.pdfIn PDF document text
    • https://bikiwilusi.weebly.com/uploads/1/3/4/5/134512037/a35083951a1.pdfIn PDF document text
    • https://bilurowunolip.weebly.com/uploads/1/3/4/3/134316979/jowatonibuxexebezob.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/xoxono.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/1849104.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/e44b085f-ae35-4511-9240-ea0db2708dcc/what_color_is_greenish_blue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e088cf3-c4f4-42ef-a6b3-c71a3cddb15f/michael_vey_movie_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382042d1-f144-40a0-989c-41397727e4c7/cycleops_fluid_2_smart_equipped_bicycle_trainer_9907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15213ff-dc43-49b9-9db0-c5e78cb37aaa/braun_thermoscan_7_ear_thermometer_with_age_precision_asda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec1f15d-beee-4657-89cd-191fbc423e36/tobopujegadasanomobepowas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b09ffe-8e96-43c4-90b3-e0cc789b69f6/givaxigasuximaninanizig.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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5424 bytes
SHA-256: 62a94e15017e842bf2b1f0c1e68ab57b4ca227edccb5772f07093030773b1bc0
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 10680 bytes
SHA-256: 2ea4b25942160d59f4b3da5a58eb94e4585d30f92d51dbfb2ed8315749eb98c3