Malicious PDF — malware analysis report

Static analysis result for SHA-256 748737d22b4eb4f7…

MALICIOUS

PDF

75.6 KB Created: 2021-04-30 20:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bba79b615953dd69ee5d9d989c766a18 SHA-1: 7461c8df0fd5378f91cb9a2d35f44fc1bd44a9eb SHA-256: 748737d22b4eb4f79b14e33185a753e5e7424d844c37e6bb0aef0acd99f8e0ad
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 pointing to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to search queries, which is likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=best+ice+cream+cakes+near+me PDF link annotation
    • http://znasila.ru/wetilutibunxq7b4.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/b869166fa4334.pdfIn PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/8269448.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/zebobeted-gefugemuf.pdfIn PDF document text
    • https://murejisigutive.weebly.com/uploads/1/3/1/1/131164542/bijojilok.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/guwulatorukawa_josapanovim.pdfIn PDF document text
    • http://gonzo-3d.com/voxumamoxataledejh0hjq.pdfIn PDF document text
    • http://wow50.pro/68676615202t7tlf.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/fesonowuxur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/42932110644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5d0ce2-4bda-4064-97cd-17cc79c9a4ff/96375624405.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/cindy_trimm_commanding_your_morning_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fe3a2e-6eb2-4320-972c-3a30ba4514b4/24517244275.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/duxexanasipak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a8d00c-c430-47c5-8522-14a00e360efb/55682936234.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/teletegibeguwipopevexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc32035-7356-4138-8146-54a49da0c1b4/94424589770.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/the_lord_of_the_rings_4k_ultra_hd_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d2f231-52fd-4ebc-9f7f-face40c5fe54/delir.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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 5028 bytes
SHA-256: 7304ebd979db1fb23f6971e4ea9365812a162739713c83422fbc027a421b0e7c
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10720 bytes
SHA-256: 14c7f2a3108852e5a0b487d637b6bbc764c3699ef87a6180d2ee9bd014127929

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