Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fdd17b0c474713…

MALICIOUS

PDF

75.7 KB Created: 2021-03-17 20:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 35fd5ab8fcc345fc5360971607f434f0 SHA-1: b9be1611855669ec03f3f1284967389834bdb551 SHA-256: 39fdd17b0c4747136036747bb40bb961f7e23e8b8da7af55ae151f5e2c97a3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing campaign. One prominent external URI, 'https://mezovuduw.ru/strik?utm_term=sennheiser+rs+180+not+charging', is likely a lure to a malicious site. The presence of embedded JavaScript, though not explicitly detailed, is common in malicious PDFs for exploitation.

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://mezovuduw.ru/strik?utm_term=sennheiser+rs+180+not+charging PDF link annotation
    • https://cdn.sqhk.co/fagaxirupunu/icz0Gc6/office_boss_chair_online.pdfIn PDF document text
    • http://idealslimitaly.site/how_to_become_a_good_linebackerc0wq6.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/gj6hbsg/nolonutidiwaziremimi.pdfIn PDF document text
    • http://pmaider.com/schma_narratif_de_la_rempaille4tn6c.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/hfdjjia/ocean_floor_diagram_rift_zone.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/beDgePh/best_peace_equalizer_settings_for_gaming.pdfIn PDF document text
    • http://inostrana.com/is_wool_flammable_minecraft6ooxn.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/bupezo.pdfIn PDF document text
    • http://summer-italy.fun/super_archery_shooting_target_shoot_rescue_cuttere8upt.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/gimizizusijatad.pdfIn PDF document text
    • http://net-klientov.ru/nagdev_bhojpuri_movie_mkvtrac6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_69739cb3ca12470db5647e3fddbf5163.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_d7466da398cb419097bc1f1c813fc701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/cid_episode_hdvd9.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_637bff32e0f84a0598a2750b4e8afc93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/anatomy_colouring_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/jawonosomiwesesuwem.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/nujevenaletibewodedigug.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/92310261541.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/57625006142.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/jasalox.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_ccea9c8f2b6c430db8e11576e1120620.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_5779cf27238942fda0fc2a503c6a1922.pdf?index=trueIn 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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 5520 bytes
SHA-256: 3a1a7e1556ee9e5f73debbdf50f2ff7c37035e0b912b2da5280d001c58f54c9e
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 11028 bytes
SHA-256: 825d712e50fc17ca687d6705fac8a7345133d5338499fcf16adb24aa130f05df

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