Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a83ce54626143c6…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 08:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04bfa1a62ea662506de59209b1fc05e5 SHA-1: d2e93f6b1337a664637515b84efd16c872e94eac SHA-256: 5a83ce54626143c6d71e804f6f87f575b2a1758bb3dcd50176c1d91b1681ce16
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The presence of multiple unknown and potentially disposable hosting domains suggests a malicious intent to redirect users to potentially harmful content or phishing sites. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=best+rated+all+season+tires+consumer+reports PDF link annotation
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/9662936.pdfIn PDF document text
    • http://garant-ritual.online/29218657749nalj.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/6df07ee6bbf.pdfIn PDF document text
    • http://magic-spring.com/datefovufelizededumhh5h5.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/118843946.pdfIn PDF document text
    • https://vijotuwotula.weebly.com/uploads/1/3/0/7/130775401/cd2e214f.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/creative_writing_lessons_elementary.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://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_95fdd634f521437596a5ac3f91e671ca.pdf?index=trueIn PDF document text
    • http://tegagikam.rf.gd/beautiful_nature_full_hd_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb227923-a04f-44d0-a035-bd8fbec329dc/wusulagababexunusobuvasap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43cf744-8c52-4441-b509-b0b448c2c4e6/what_are_the_five_stages_of_system_development_life_cycle.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_e335798ca6aa48ef8a5b7bb643f45bbd.pdf?index=trueIn PDF document text
    • http://kalotiwinilobiw.epizy.com/bajrang_dal_audio_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 5148 bytes
SHA-256: f4b52059b1a1ff19345174eb377cdc626a20b6a8537063824f37573c2a2d537b
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 10716 bytes
SHA-256: 42e00decb21b4dff83b3c430704862cbe81e98bedcc2a98c34d14ade184f8e4d
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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