Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41a9df81aaffc58…

MALICIOUS

PDF

81.7 KB Created: 2021-04-01 07:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 549ca3542d16309372506e9be4d505d3 SHA-1: 2e4187aaaeac3423e62a16ecb15b9349cd6e448e SHA-256: a41a9df81aaffc58ba6edd6f1f1d3034d598840d5a6073254b6ca5754d89a55f
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs like https://dugedepap.ru/strik?utm_term=ged+math+practice+test+questions+and+answers and https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/sitikame_zurumasoviwi_vudanajokinoxaz_sivikamesago.pdf are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/strik?utm_term=ged+math+practice+test+questions+and+answers PDF link annotation
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/sitikame_zurumasoviwi_vudanajokinoxaz_sivikamesago.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/a44263b9d9186.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/7648802.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/4553763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_60385819a6eb9.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/jafifaton-fumej-tegagefuruzuj-pegubuwu.pdfIn PDF document text
    • https://gobalubige.weebly.com/uploads/1/3/5/3/135339343/rasevupovunozumoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fdd375393d35.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/309a58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_601caebf35e82.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/9725601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_60651f0fefebc.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/d8faba03-b5c7-4566-a9c2-26b0a1724769/55041886254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298aba6a-0f8e-4d3a-9238-1bb9b9a09b7b/why_is_the_wave_movie_rated_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14db0c19-18ef-445d-a871-a31afc91b5ae/satotakogevamosot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6e75d5-6a3a-4086-a10c-e419c217f3c4/formato_para_crear_empresa.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_128d9c7a901341b4bfcdf0ed45481497.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_056bfbc789fd471a82dcdc98d75e59c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/629c4f2e-91d6-4139-8f8c-98bcb09923dc/nulobitofoserelaxefuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5734d56e-166e-4115-824c-421106ac480f/46425379696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b437c45-99c4-43da-bc78-16c1ab2238e1/24767033309.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_794bc82c182b4c0abe16187965e47d62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/315d8bea-0857-43e0-8c4d-bed7c211c233/28478038327.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_6471189f30a94c73a19d32417bf521b9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 5412 bytes
SHA-256: cfa2177042d1a472bb8aa1525185dc2408c9f112b2e9fe84e520a56fcc1f389c
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 11192 bytes
SHA-256: 2b85903a176d48565efb1a4b0096c792332011fbe034efd22fde86f09bf3c3ec
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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