Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab85ff38b398dbfc…

MALICIOUS

PDF

83.1 KB Created: 2021-04-02 11:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 603c3322af50ba1fdd9ab0f913939eab SHA-1: f4f8cfd43704e201e2891fac194af2e09bd904f7 SHA-256: ab85ff38b398dbfc93a51ceb6966161511cd9b3e8360cc4d9e06f90943f7cf7e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://seumenha.ru/123?utm_term=picsart+apk+old+version++2015', is particularly suspicious and likely leads to a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/123?utm_term=picsart+apk+old+version++2015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427284/normal_601be7f287ba0.pdfIn PDF document text
    • http://doxewoga.iblogger.org/what_are_the_different_ways_animals_communicate.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/71377f39cd4.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/automatic_gain_control.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447107/normal_60031e094640c.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/bowflex_revolution_user_manual.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/1a548d4317e74.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/195b89811473c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_60270c437bb4d.pdfIn PDF document text
    • https://rugadugunat.weebly.com/uploads/1/3/1/6/131606951/kajixaro_tukerojefegaziv.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/kifeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fe0658acca1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8ac9f7d4-1278-4971-a863-7ae2b387722c/how_much_money_start_monopoly_rules.pdfIn PDF document text
    • http://xovanesoku.epizy.com/85224014095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc7888d-4e94-4ff6-9d74-82b853ba2b32/buboloxakusafabixim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3b088f-a2c9-4a7a-a511-b071ca16ab73/what_is_the_average_middle_class_income_per_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c91c34-fcd2-4f1d-a24a-ab00d47c3159/how_to_turn_off_honeywell_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94075019-2f7e-410e-9452-04fa98d380d7/meaning_of_back_to_my_roots.pdfIn PDF document text
    • http://xuzixezo.rf.gd/judatopejogakovefurowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8499425-d548-40f9-a84b-970851dcde1a/95830823657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3845554-6eb7-49f5-97aa-0c5ced353238/how_to_tell_if_anker_battery_is_charging.pdfIn PDF document text
    • http://naxilolebepup.epizy.com/gozowaxivozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f789c7-9cd2-41fd-9920-fe3fc13c1418/zebco_33_classic_parts_diagram.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 5428 bytes
SHA-256: 418d39266ea57e6bced6d988ed491b86fa6e0c8a1bf45b479d135eac5e371c34
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 11592 bytes
SHA-256: 2334cf383a9e4b55db26256f9259d115a3f715b021aa60f4b662b8e82cf93978
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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