Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba1233ab279f881…

MALICIOUS

PDF

76.3 KB Created: 2021-05-15 14:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a1f7618eeeebe925fd986fa9833f6b53 SHA-1: e1890c7209af1e6e6013aa9afbf7f00ff6e1c9a5 SHA-256: 8ba1233ab279f881fd455acc614f6709c14ac88b2354fc138b4ef470247ca24d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=flysky+fs-i6+failsafe+not+working PDF link annotation
    • http://whitetwo.space/amcap_full_crackv2l8c.pdfIn PDF document text
    • http://grinallex.shop/poema_en_lengua_indgena_con_su_traduccin_en_espaolfoxps.pdfIn PDF document text
    • http://dazudur.22web.org/gesisuligunivugolupepesug.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/ropazasudu_dupobuzarorebav.pdfIn PDF document text
    • http://jotijitod.66ghz.com/73464367892.pdfIn PDF document text
    • https://gufobetatogeset.weebly.com/uploads/1/3/1/0/131069923/4813410.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/susevefu.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/8f8ceb5d1.pdfIn PDF document text
    • http://yoptan.space/can_you_get_nfl_channel_on_hulu_livefjp4n.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/fusot-pilevotorubom-fekuvorizimapi-jikuk.pdfIn PDF document text
    • https://sedesafatowezu.weebly.com/uploads/1/3/1/4/131437285/4284995.pdfIn PDF document text
    • http://nosinoski.shop/dezelubolagajuzitowuoqxuw.pdfIn PDF document text
    • https://tupemewona.weebly.com/uploads/1/3/0/7/130775182/846f5e3ba58e.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/4950be2eba.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/fac6d689b0118e.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/58049175246.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/5668335.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/vetuki-fibifavofimuseg-nosaledelelonew.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/gaselunuxelo-pojeru.pdfIn PDF document text
    • http://strgb2.ru/shakespeare_hamlet_quotes_to_be_or_not_to_beul9xi.pdfIn PDF document text
    • http://smartcoin.design/50539062406r8txr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukagodikuve.rf.gd/hemoglobin_a1c_conversion_charts.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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 5332 bytes
SHA-256: 2e35c8b1f9ecf8a9b2a472278f1b1d3c86cd8d49e5d49acd9792fc41e2eb7696
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 11392 bytes
SHA-256: 474ad431a654c86a62e528620b4d91cebbea89567b3bb463d651d62a8198d6d6