Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a61006e45c5ae1…

MALICIOUS

PDF

80.7 KB Created: 2021-06-08 07:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 92c3dfd8a88bdc99902e0e48a13d54c9 SHA-1: 99057f03181bae9c3df48cce1ab4fc67780ddd4f SHA-256: c7a61006e45c5ae10ea9797387aa108b4f5c1687876670dc8d25234849c24372
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious sites. The primary URL, 'https://smidgel.ru/pbw?utm_term=how+do+i+prepare+for+a+lab+interview', suggests a phishing or scam attempt related to job interviews. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://smidgel.ru/pbw?utm_term=how+do+i+prepare+for+a+lab+interview PDF link annotation
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/gadiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5fe2bc615c157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_6030149e1167f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_60b7cd40239e7.pdfIn PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/gafimepabe_tiderudofuta_nikoto_mixotolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_602af9d00d5e0.pdfIn PDF document text
    • https://divopugizupuja.weebly.com/uploads/1/3/4/4/134487222/dezefupovuka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_600758f2eae0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fe52e57adea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_606713adad30c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcdddbc1d807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413707/normal_6004b4e86e1ed.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/02af7c58-fe20-4d85-a44b-c228ba98ae60/walter_riso_frases_de_amor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b9db0f-894a-4442-a138-2c1016ba9edd/wikudisupudefuxojogamuduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c239df6-9579-44de-ab52-3d2bbdf93f50/61215970151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c933497-d6ba-48eb-9c3c-634bd7265d3d/how_do_i_know_the_authors_point_of_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d07596-c8e3-41a7-8f63-e9279d2b70da/how_to_reset_a_samsung_fridge_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6921682-019b-4d49-b474-d9968d20f3ca/safety_not_guaranteed_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb551eb8-6728-4d2c-8fce-3e408b419b48/how_to_learn_music_theory_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99923b99-8163-4968-bdb4-2225fbf411f1/12843454593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e4c0d8-e94e-4180-b55d-7396157e71c7/1048663951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbde6626-c20f-4091-8cd4-a217d169240e/musical_play_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2743fd80-6266-458a-8e60-c910746b1009/66497573657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52077b8-6af7-47af-aafc-746873365063/burger_king_near_me_home_delivery_near_me_now.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 5108 bytes
SHA-256: 29d3c4f19a5895073069b2b229b0e85832b6f5aad71a9917981ee19b8d8464da
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 10408 bytes
SHA-256: 996f44b111b24265ac75c997cfe2aae62e917da7f3a055da25aa1bb2fc37cb77