Malicious PDF — malware analysis report

Static analysis result for SHA-256 3873986eeeb641d0…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 15:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa500ee1c029d488a14cd3283453df67 SHA-1: 85b2ed1b989231bec0a72c58e7fe8ca48146f2f0 SHA-256: 3873986eeeb641d0cb06e8956d086da8a28e31fcb121d5370cc6bc618dc16357
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=get+post+user+id+wordpress PDF link annotation
    • http://cucoupon.info/ikea_nutid_wall_oven_installationd0e5o.pdfIn PDF document text
    • https://xowonijateroz.weebly.com/uploads/1/3/1/3/131380337/tolalap-fasiduka.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/620171.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/vevuwetagakaru.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/eb563b26eca.pdfIn PDF document text
    • http://gouliwer.online/atal_bihari_vajpayee_kavitaz5h57.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/kukajuwabadelam.pdfIn PDF document text
    • http://tosety.xyz/12480273181vopk8.pdfIn PDF document text
    • http://itasda.online/videohive_vintage_music_opener_freeoitdw.pdfIn PDF document text
    • http://getporte.xyz/34753846393xd1p6.pdfIn PDF document text
    • http://zoom-omsk.ru/sony_xbr49x700d_wont_turn_onm4eox.pdfIn PDF document text
    • http://tixshopclub.fun/types_of_organisms_found_in_an_ecosystempaa59.pdfIn PDF document text
    • http://pogadai.xyz/futibomipugycnpd.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/boralak_wazobovipomedu_nedupiduxabujak.pdfIn PDF document text
    • https://zigudawaza.weebly.com/uploads/1/3/6/0/136035030/jimadovabutiwofagip.pdfIn PDF document text
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/baninuxej_nurasefo_lisaramirerapoz_simizeg.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/513e94be-cbc2-4d65-9bd1-74270e13262f/can_you_mortgage_property_in_monopoly_to_buy_property.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81aa6b7-8051-435b-a235-8374f2a96a0c/fourier_analysis_an_introduction_stein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ea7fa6-bcfe-4c08-be3a-6ab23434b4c8/reradobutodi.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/gikodetufuwisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3d053d-b152-4647-8f47-b2052688ad05/cuisinart_pro_classic_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/messaging_apps_for_iphone_and_android.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_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 4832 bytes
SHA-256: cbe1c706cf7c9e61ab34435b35cf30964b8ba0fd7863751afeb40a1709d45499
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 11932 bytes
SHA-256: 13dff06f0aede2824e6816dad87955c00951a5cafc8a6cc159325f82767d2a30