Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec5acd30e3dfd86…

MALICIOUS

PDF

92.7 KB Created: 2021-04-05 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7cf74b9c2bbc01ce36b34b0367ebb4cb SHA-1: 111f3672767941057dde82988ec8983522829847 SHA-256: 0ec5acd30e3dfd8641afb267aa87580fc9f3d60e9fd4c6ca1415d8ff99ab4949
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+much+is+a+washing+machine+repairman PDF link annotation
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/wiwiru_tozosivarat_wumesaxul.pdfIn PDF document text
    • http://5coupons.info/974424240288x23q.pdfIn PDF document text
    • http://pujesuwidiw.22web.org/king_size_platform_bed_frame_ikea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5ff97ad2b5bf8.pdfIn PDF document text
    • http://dontbeshy.xyz/fitutuseritigofimaxatej9nv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_604ae3b4950af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385231/normal_600653b5f2f23.pdfIn PDF document text
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/zomuzege_pafujinifaxu_gulodevabibos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_601ff8932e0a3.pdfIn PDF document text
    • http://zimipodetasasa.iblogger.org/coursera_machine_learning_andrew_ng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_604d67e761893.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/b3418df6-7908-4881-b5e7-e541eeb9199c/dusafatiwunofuromo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990cf38a-e3ba-4985-9ebe-2fe5a0ea08b8/gamoginavisosususosotula.pdfIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_6ad357a6177c4def946e893aa622c37d.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_ab759c7dcd8347c0a55e1fd6203bf733.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1639bf3-26ef-411d-af6b-517e33450cff/what_baby_poop_tells_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4947a651-384d-4be0-bb79-26feb4b61bbc/nato_phonetic_alphabet_phrases.pdfIn PDF document text
    • http://wekijedi.epizy.com/can_apple_tv_remote_control_ipad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 5168 bytes
SHA-256: 7a37c9538a6e277389fcc6f17071d54707596ef660e5ab40e074be3ec8ea5342
font_01_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 10840 bytes
SHA-256: 953b8799f7b66967a5c1796482be65ade627f12c64217aa2ff4f5c5cfe79ea95
font_02_sfnt_off000141df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DF 16148 bytes
SHA-256: 333c6b7950143ef5b768b9d621755905cb9f9f437be433e332b6baa8edb2b5fd
font_03_sfnt_off000156ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3