Malicious PDF — malware analysis report

Static analysis result for SHA-256 30381507e79506a5…

MALICIOUS

PDF

78.0 KB Created: 2021-03-21 11:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fb1f77925348a02d683a585556f913c2 SHA-1: 0b795f24bd1df916b400547e93afbbad0de38621 SHA-256: 30381507e79506a5ab3fb9513e45ba10fe9590cb186b8841cfa2f091759ff03c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=powerbeats+charging+problems', is suspicious and likely leads to malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://zajinet.ru/strik?utm_term=powerbeats+charging+problems PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff0467e6c264.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/kogifitig.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/zawove.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/xigurigokaxajaver.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/50118f.pdfIn PDF document text
    • https://zigepavozaw.weebly.com/uploads/1/3/4/3/134349437/1891273.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/tc_helicon_harmony_singer_1_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411231/normal_6007fa51e762d.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/improve_your_vocabulary_by_1000_words.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_602987700f57c.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/solve_simple_10_math_problems_quiz_avakin_life.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/888b53b2-15ee-45fe-b0ba-113ca13d9c02/lakujuzumafuvuralezozo.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/dell_monitor_u3415wb_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4caba5-40dd-4b85-8374-2ac32da837aa/37679208810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001717c1-22f1-4bb1-a741-17011a58e0d0/penorelumozujev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7685076b-3a75-4b4c-b4ec-0dd82dc04ac5/what_is_the_best_brand_of_fridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc352ebc-af49-42ec-abde-3476444620a1/45770737923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7408a603-92d9-4b9c-8b76-fc0f31865169/streetcar_named_desire_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d493d8-3db2-42c8-ace9-b745ddf61abd/sevusetalugawo.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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 5580 bytes
SHA-256: 0549f98597110bd3a80b59ac5d0e03485db377d7db61255823b614a639121c64
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 11420 bytes
SHA-256: 49d7086f87006df0ae909d51b66ab80995bcd6df518869c8e3c0659e73ed91e7

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