Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafd9a1bf89f23ec…

MALICIOUS

PDF

72.2 KB Created: 2021-03-29 22:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5da666ec56b437359f865971b3a3113c SHA-1: 5c05c3a5d2829ab8775eb08bb1829983e57fe50e SHA-256: dafd9a1bf89f23ecefe9867feed858c211c38f9d6e2fd4b3d1a768c8985e3696
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to drive traffic to external, potentially malicious, domains.

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://midufefew.ru/aws?utm_term=can+paint.net+open+svg PDF link annotation
    • https://cdn.sqhk.co/zopizote/jJPdG5G/jopasikepide.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/4445590.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ividjgY/rollercoaster_rush_game_online.pdfIn PDF document text
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/pugomizam.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/da56be5b572c7d.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/gjjxhjY/16686112180.pdfIn PDF document text
    • https://rexavinuzuna.weebly.com/uploads/1/3/4/3/134308075/sotinumamoluvomotat.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/Ihg1Vjh/80160500135.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/b4629f41-eadc-4ea4-b5fc-7d85afe23fbf/tissot_t_touch_battery_replacement_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/xoputaxasapizedunaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f32842-1ab5-4d4d-a672-c7f9dae8daf8/pewedibevixunuwabevekapif.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_1668d7a754944199a65fe58803c865a0.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_c18cfb524ff14600834083d97052592a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/best_android_mobile_games_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/string._format_null_string.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/consonant_blend_worksheets_for_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dd71d0-da61-4313-8839-f897403b098f/how_do_i_activate_my_verizon_mobile_hotspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b035d73b-4057-493c-909e-6533cab305aa/7747394973.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/bloodshot_trailer_free.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_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 4856 bytes
SHA-256: d25055d788cc094f11fa34f14e064f2864d8b233679d6c2b731092ec6ce60b3e
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10696 bytes
SHA-256: 22f8cbe71d9c631079e3d03a6bafa86aeb4ebb72b46e0c2273968983087121c0

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