Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3f833ba7a7c806…

MALICIOUS

PDF

119.3 KB Created: 2021-04-08 03:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d82718ed43a7b23a157aab366f2d04c1 SHA-1: cbffac5e334395b29a8712bebd0bee507ed018c3 SHA-256: 5b3f833ba7a7c806517ceee89ae1e7d4b7cbd946b44923576d6e756dbb4365f3
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 hosted on disposable domains, characteristic of a link farm or SEO spam. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=bio+fax+karyotyping+cancer+cells+answer+key PDF link annotation
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/285c50.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/gonunewufe_bozetega_xixipiroxepa_firajojetasas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426277/normal_5fd7dff1165c8.pdfIn PDF document text
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/bevarexoforenibus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_606398a54f6c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5ff06f88c1444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_60188f925cccd.pdfIn PDF document text
    • http://trenolgia.buzz/what_model_is_samsung_tablet_ce0168kdt0c.pdfIn PDF document text
    • http://sijufur.22web.org/69871184942.pdfIn PDF document text
    • http://whalesqpa.fun/12632091574enm5w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60309ce2dcd86.pdfIn PDF document text
    • http://sedouche.xyz/duluzajilehpsh7.pdfIn PDF document text
    • http://bidusifekinu.66ghz.com/metformin_xr_750_mg_side_effects.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumavoralamo.rf.gd/archicad_21_mac_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb3e949-0446-4ad1-b060-db34b58f77d4/5596625724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f15b39-2d97-42dc-a61e-0c60936e9a21/sagolizaragum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0989b7b8-8957-413b-bc53-c49f0f9f3d23/69222569425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f404dcc-a7e0-40ac-9677-fa7abda364f2/how_to_do_a_colon_cleanse_with_apple_cider_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afd1154-6cab-44f8-bc04-9f12d7833289/convert_amazon_kindle_to_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62979d6-ec8e-44c1-a534-dd0772bc9572/how_to_clean_a_really_dirty_keurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418a338b-18c4-4731-9e49-bb2dd7ba709c/6049461238.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18065 5560 bytes
SHA-256: c3e0e0de5fde22e6d4919a11d26005b1a716217f710e89618688bab559356d3f
font_01_sfnt_off00019391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19391 11604 bytes
SHA-256: 6c5f3692022425c40b2d30f0fd88e116f7c2feb2670e4da667d8f857e8c75eeb
font_02_sfnt_off0001bb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB01 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90