Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b73eafc7cf0137…

MALICIOUS

PDF

88.2 KB Created: 2021-04-04 20:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3f548377240915cb54cdc2e3445110 SHA-1: b74689030176fe42915f5bc269338121a21b9449 SHA-256: 99b73eafc7cf01372f60fa51d3a9454f3ae0dc7802120a743f5e327bcb55d92f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful websites, likely for SEO manipulation or malware distribution. No scripts were extracted, but the PDF's nature points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=how+often+do+i+need+to+regenerate+my+water+softener
    • https://sozejaras.weebly.com/uploads/1/3/2/6/132695734/ffa12e94d1.pdf
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/804c72.pdf
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/9735527.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/kinoraw.pdf
    • https://vizexetu.weebly.com/uploads/1/3/4/8/134864552/rukulimi_taxiwug_riguvosarax_palotel.pdf
    • https://cdn.sqhk.co/kogeledewafo/Bp1ehcx/warhorn_sounds_of_war_horn_music.pdf
    • https://vowomupow.weebly.com/uploads/1/3/4/8/134846305/ece05caa080d1a4.pdf
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/d2b58681fbb8ecc.pdf
    • https://cdn.sqhk.co/numiwuzuwix/c3Xjhf0/critical_ops_hack_apk.pdf
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/nivanir-gakup-mewet-fujovilezitutok.pdf
    • https://binezorimitujux.weebly.com/uploads/1/3/4/3/134337637/fekizojidosuge.pdf
    • https://cdn.sqhk.co/ruwonumatag/iEheCUP/dead_city_zombie_invasion_mod_apk_download.pdf
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/dawegomo.pdf
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/9176926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f20c0d8e-4195-4330-bd4b-35492156f873/how_do_you_do_basic_fractions.pdf
    • https://uploads.strikinglycdn.com/files/ef3cd9ba-ed68-4d3b-8684-a9240652d0d8/neredekutoj.pdf
    • https://uploads.strikinglycdn.com/files/9a3a1700-0a83-46ec-95d8-aacd76fb6115/tim_farriss_inxs_net_worth.pdf
    • https://uploads.strikinglycdn.com/files/86abc8ec-8ba7-4274-97e3-5a81edc1e247/how_to_reset_a_front_load_washer.pdf
    • https://uploads.strikinglycdn.com/files/4a34acd6-8234-4130-9072-55e6fe2c2c38/tips_how_to_start_a_small_business_in_philippines.pdf
    • https://uploads.strikinglycdn.com/files/725e4c65-c6e5-4de6-a4eb-ee6781622b78/nadujug.pdf
    • https://uploads.strikinglycdn.com/files/d5d406de-b781-4f1f-a458-257990d25e66/shadowrun_2007_gameplay.pdf
    • https://uploads.strikinglycdn.com/files/5ab5405f-ba33-456c-87af-df91ab60ea22/9286219375.pdf
    • https://uploads.strikinglycdn.com/files/bacdcc6a-a029-437c-80a7-0a068a0ab729/risopuvawakuzubafa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e9e.bin
41d21ef8bb020dce4e1ce3888c88b9c632e2bde5744d91c3a75d6cb47c76e2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 5136 bytes
font_01_sfnt_off00012010.bin
5bb5d20455a6be7623cd890d8d3f93d69990cf3a21f5301b0e8a0b57926b591b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 10820 bytes
font_02_sfnt_off000144a0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144A0 4324 bytes

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