Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06dbbd9f7120918…

MALICIOUS

PDF

82.5 KB Created: 2021-06-09 11:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b504badba427dc5504d5a6f59038f7b9 SHA-1: a94b3a04e7c5204644abaed20fe8f0c07e6ea55a SHA-256: f06dbbd9f71209185db3fabd495c775e78a73b3fe85d61ed304c17d7a7fa509a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/pbw?utm_term=watch+rupaul%2527s+drag+race+all+stars+season+5+episode+8 PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4369487/normal_60b64ed252c18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe5d6d88f3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_6051ad607e9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_60220ac1bda36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6026d457a8afd.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/6661860.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/zarivomeluxiw.pdfIn PDF document text
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/pexam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_603453c88ecab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467910/normal_5feeb807e7c73.pdfIn PDF document text
    • https://wimitefadekox.weebly.com/uploads/1/3/4/5/134586198/6289298.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/31540343-9a00-4d82-921d-6b4e3ba8907e/67480369064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd7805f-a334-43a3-927a-8866520fb1e1/what_is_raise_to_the_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af291617-3c5c-4375-8d78-9ea39c45f7ee/67453912206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34318b6-fa84-4d6b-a6b0-011dc1adc680/74749211580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93257af-22b5-4718-9bf0-c4c51190d407/92340770384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f6300a-0c73-4114-b8ea-74cdf7752146/how_do_i_say_the_apostles_creed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dff5b9-2812-4a56-b78e-5a7b2cf7c4cf/rituruvoxasuxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7570acd-92eb-495c-b738-2af076812cb1/7749868908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232bc563-edba-45fc-9b6f-7cf7a2f69010/99765403143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2778adc5-8c52-4a04-8a74-99886acdbee8/how_to_make_a_solubility_curve_on_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d9f0cd-1dee-47ef-9c43-c8a9bae383a0/what_is_the_best_free_flow_exhaust_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6134ab4c-74fd-4e13-b70c-daae62acecab/muzotit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b4d271-e358-486f-bc78-dad875ce331c/what_your_first_grader_needs_to_know_table_of_contents.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_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 5700 bytes
SHA-256: f893fa24e85a814b66ea3625ef4fab8a7e71fdbc688d6656205470ea55aca43e
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 12240 bytes
SHA-256: b925fb30e0c7315a7166d7d7e82598c479a01ac4dc7b27bc5c6d06cb60ab7c9a

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