Malicious PDF — malware analysis report

Static analysis result for SHA-256 c035cd2b847d7418…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 11:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 012b2f822a972e6bf173c710f62b3f0c SHA-1: 8548c8124897023bb7f78b042014d86e0b39d48e SHA-256: c035cd2b847d7418c3612bb2f278a5abd95ae226496db5f76cf73cb688cce191
186 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, many pointing to disposable domains and potentially part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The embedded URLs suggest an attempt to redirect users to malicious or SEO-manipulated content.

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/wix?keyword=the+interlopers+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fcdd5d66dced.pdfIn PDF document text
    • http://pajebunekelisom.22web.org/fisimokulakanidurur.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/duighaz/get_acc_e55_guide_valve_sequence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_600b9015743c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fe7a88f7da6c.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/ohbiVqn/monster_vs_ball_3d_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/aNuSTvE/retroarch_switch_1._7._9_nsp.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/FR948ie/pac-_man_world_rally_ps4.pdfIn PDF document text
    • http://menetufebev.22web.org/chemdraw_prime_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/gTuH9Rm/arteriovenous_malformation_ascending_colon.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/ibIQ3ha/50920984993.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/iifjjih/rally_age_health_survey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_604d3304e6f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6037a09e1808d.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/KkTijbj/turawusavog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_9c9c9b58e2f04937b8c747a01c8e2e07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/affidavit_of_service_form_qld.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/xapimixi.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_bef05da8a4d447bd8ebe325a6b152c14.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_2aa931af4fc844b996a2ddddb686fcab.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_e359032a560b458ab47f8769b17ea353.pdf?index=trueIn 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_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 5064 bytes
SHA-256: 2a6a98f1d52ff0cf093b0e796d6581fd38b3da8ca9959e6ca6c3c3f9eeb1b428
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 10912 bytes
SHA-256: dcc39e81e7603f184d70ad33c7ea3bb1ce60e4aa7740ad1841120ab35039fa2e

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