Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fdb68a1ce32c01…

MALICIOUS

PDF

79.3 KB Created: 2021-04-05 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 275245f77cc25af2d57483965f826ca4 SHA-1: 5ecfd00efd97100bb7b1f53c1aba826f8111e361 SHA-256: c8fdb68a1ce32c0173b6c76f88e7f060ae94f372e6ea9e521adb1855114958ea
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 0.9991

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://fokemale.ru/strik?utm_term=define+effectual+in+a+sentence PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456999/normal_6025c076bc903.pdfIn PDF document text
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/fiwofebux_kuvamofutemun_vizijazisupipug_bupuxerali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_606a518a46366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_60271e02db04d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fd5fbaf13aad.pdfIn PDF document text
    • http://reweder.site/what_is_a_rational_and_an_irrational_numbertclgm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486365/normal_5ff6ab9c61741.pdfIn PDF document text
    • https://tinulesuse.weebly.com/uploads/1/3/4/6/134689832/pexabopafan-rirotalifoj-xifakolebokum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_603829b9aadae.pdfIn PDF document text
    • https://wabalolosezuluf.weebly.com/uploads/1/3/4/4/134462862/5fe1b76f0498f9.pdfIn PDF document text
    • http://pycnidwzxc.info/32921826230gj0t3.pdfIn PDF document text
    • http://everydays.space/5668699375490ve7.pdfIn PDF document text
    • https://sixobeludid.weebly.com/uploads/1/3/5/2/135298518/7286479.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/82e55b9e-cc35-44ba-8a09-fa7304ad6ac7/pretties_scott_westerfeld_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c08414-e9fe-4d0a-b55a-c35b2eb1d4c5/40606156429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb9b006-b3e9-4420-ba35-70023281a576/latuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb9d2d9-d693-4883-903a-d2863f6ea328/how_do_i_access_bookmarks_on_android_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5d3e4d-f404-4663-90d5-017ee1b18caf/how_to_connect_sony_bd_remote_control_to_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de501cb-07df-456c-a652-bcb54010025d/tfs_tutorial_for_developers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4162ff2-e459-4a17-8d2c-83dbca708735/titipegurufej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54babf7-4394-4cba-b57d-b70247b489b7/honda_harmony_1011_riding_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3177abae-d67b-4a90-968c-c42779bbca8a/pipijisuwoguxadule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2953cf14-5389-4196-abe5-cf8e77d0e58f/66212516173.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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 2976 bytes
SHA-256: 43d197e4c3bb1b8578a6af5c8ceb4b12ab857954bc69d1f6bea7b3ed2bd247c7
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 4776 bytes
SHA-256: a9ddd5149f5a8d0869eeea184b6e47008f86af827db6be94b98462a298e4685e
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 11216 bytes
SHA-256: 34f2092e01c3702bee9a45d7906500c908b5fc3a83795cd586e060e9e21f555c