Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddcb0b69d91b458…

MALICIOUS

PDF

83.8 KB Created: 2021-03-24 06:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 156d033b193ec2772dfcb428f38d4629 SHA-1: 58e053a5b1412f85396cc6726239cec3a5785a52 SHA-256: 5ddcb0b69d91b458e8389f2c40f69267ba19f791cf505cc936d1f0deeeecba06
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is `https://jumiwimov.ru/123?utm_term=avensis+verso+workshop+manual`. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=avensis+verso+workshop+manual PDF link annotation
    • https://cdn.sqhk.co/wofunukasu/hgeRjjQ/english_grammar_learning_free_online.pdfIn PDF document text
    • https://mobugozuko.weebly.com/uploads/1/3/4/8/134869294/kirixukizojo_xogapixit_vopelife_bigodore.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/axDr4hh/fancy_car_names_for_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/hiVhggh/zazavebuxapekiwakofuwak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fca4814ba81c.pdfIn PDF document text
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/domagik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_6048a36f7e687.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/VjfPigy/senior_digital_marketing_manager_salary_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/fetesulatol/iby8Mgi/54985161306.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/41ddcfc4-5af5-40bb-9a5a-58af9a21760c/icd_11_classification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca62c4f-46a9-4a10-81dc-ae2fcb471ea7/how_do_i_start_my_ez_go_gas_golf_cart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4165543-158a-497e-9699-3e085819e90b/87571652996.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_3fa5fe09a1474e5e87dd70e99f505ada.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_20baf1aee6034052b61a79ce7328c3eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10f12c2-3133-43a8-94bf-89386e83ef0d/mupelunemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49142ba-9933-46a1-be3e-e7ca24a0c1b8/what_is_bible_trivia.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_25b3a87808134da28b1d286a7726f7e8.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ca0dc67ca70d4cc68b61cbaeb406e093.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b70db5-888d-4a27-8a3e-af3583c9b054/bandit_mp3_download_paw.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_cdaed72a14f14039b561a5de4c56b18f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb62ee6-60b5-40b0-b166-a3ad931a4c39/hunter_douglas_motorized_shades_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa37a53a-1cef-4e3f-95f6-6ee67e03a64a/lost_books_of_the_bible_amazon.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_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5068 bytes
SHA-256: e75e5c138999b29b15cd41b0a9f6a59d34df3e593907c8cf752e32ba4fdebc76
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10996 bytes
SHA-256: 759207bb83c10ac77c01b72fc15fe9eeea1833c557f8f4cb2f1c1afab97233b6
font_02_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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