Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa8152a760376fc…

MALICIOUS

PDF

77.4 KB Created: 2021-04-08 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4e35d7ea1cfa33353fa5e0a16b017c7b SHA-1: dd558ea58560f8f5f9f7c8ebf2c19855dab36344 SHA-256: dfa8152a760376fcb9f4c28e4613d92ae85f66e7b14efa7f877ef32dfe3966b6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, with ClamAV specifically labeling it as Pdf.Phishing.Trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO manipulation attempt, potentially leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/wix?keyword=shield+dwarf+clans PDF link annotation
    • http://fanilepitas.22web.org/gutatemukenen.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/ffc1a.pdfIn PDF document text
    • http://jebewif.22web.org/best_android_emulator_for_pc_2gb_ram.pdfIn PDF document text
    • https://fipakitifenilab.weebly.com/uploads/1/3/4/0/134042330/6426101.pdfIn PDF document text
    • https://tigaguxekebopu.weebly.com/uploads/1/3/4/5/134592721/zegixokelar-lulubewogudov.pdfIn PDF document text
    • http://kebakef.iblogger.org/purederetuxosesugifimira.pdfIn PDF document text
    • http://dosijaruwiteli.mywebcommunity.org/lugopawipefunag.pdfIn PDF document text
    • https://gagebopa.weebly.com/uploads/1/3/6/0/136051288/1921349.pdfIn PDF document text
    • http://parkingtest.xyz/how_to_structure_a_pitch_deck029ie.pdfIn PDF document text
    • http://missunik.space/directv_4k_genie_mini_clientr6y6w.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/17022276200xgem0.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/geological_time_scale_free_download.pdfIn PDF document text
    • http://gedozudusinap.mygamesonline.org/zejufigaj.pdfIn PDF document text
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/talumawuvetufasut.pdfIn PDF document text
    • http://creditactive.info/gilupudadimida0lmz.pdfIn PDF document text
    • https://faxefijuw.weebly.com/uploads/1/3/1/8/131872096/mopamebonodiz.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/86628fc727.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/3029856.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasomibaben.rf.gd/child_love_images_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d26f658-bd9e-47e9-80e2-ff2a42aea0aa/48803754368.pdfIn PDF document text
    • http://meguwuzib.rf.gd/firepower_1010_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf67fd38-2cfa-4375-8c0b-a727f960d059/kedagazagazefukijet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47eb4c7f-d70b-480d-978e-17942f522621/jetujiterabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1802fa96-3f62-4151-806f-b3a119589056/sunexiwozokutuzun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef1d361-cde4-440b-b5e2-488f2fa589ea/how_to_draw_a_turkey_using_hand.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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 5304 bytes
SHA-256: 1f7c3d1987c201aa432105e2860077dddf8e5aac5ac9b9200562b889e1d228e9
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 9996 bytes
SHA-256: deb5aa71c908d4ee4eeb938ac7680cd732c6222639a02e15ab4d9e6c582c14d1