Malicious PDF — malware analysis report

Static analysis result for SHA-256 de19094756213983…

MALICIOUS

PDF

86.8 KB Created: 2021-04-23 23:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 388a6c37a6e744751a17573eb8a4c79a SHA-1: c1e30dfa4f552510e7502daaf3a39b896760e23a SHA-256: de19094756213983d0ecdc364581aadcd117e6748328abc9248188b45a36b14a
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, with one specifically identified as a malicious redirector. The document appears to be part of a link farm, likely designed to either distribute malware or engage in phishing activities by redirecting users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=obra+sue%25C3%25B1o+de+una+noche+de+verano+pdf In PDF document text
    • https://cdn.sqhk.co/zijigemeworu/bstijjf/solusotoxedizapizipire.pdfIn PDF document text
    • http://xowivek.iblogger.org/42937355211.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/Ghjhhic/35228348287.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/wotededikokadulinalo.pdfIn PDF document text
    • http://sobozunikira.22web.org/xonejopatazegaput.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/59uHja2/26131559866.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/didUI5v/lafejonakuwanix.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/1TOwge4/mens_hairstyles_longer_sides.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/ighi2gi/minecraft_bedrock_bedwars_server.pdfIn PDF document text
    • https://veliwomi.weebly.com/uploads/1/3/5/3/135343105/zukobide-sobomis-razegiziduzego.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/ghjjgiq/xewopedokumepubevilojid.pdfIn PDF document text
    • https://cdn.sqhk.co/merebiwisux/giidghc/mere_paas_tum_ho_novel.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/gJJjgYG/solar_tax_credit_2020_texas.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/a882ee8d-018b-43ca-8c59-c785045f14a1/free_printable_number_chart_1-100.pdfIn PDF document text
    • http://budekibume.epizy.com/digital_design_subwoofer_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da68c1cd-9a40-4e58-9d0e-eec177479de9/konosuba_light_novel_vs_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106eba6f-5486-45f2-9eeb-3d4cd84447a1/kevefidixobavudotowesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93371eb0-db12-410b-bac9-abcf3a3db857/star_vs._the_forces_of_evil_star_and_marcos_guide_to_mastering_every_dimension_guide_to_life.pdfIn PDF document text
    • http://gavilisijev.rf.gd/73049846147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe254f5-5924-4341-9fd9-52eeacf3ba3d/words_that_start_with_nor.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 5648 bytes
SHA-256: dc2f316b9860c07e405ede0c2c54169990c6f76f4ccdb4de5a7f68ccde6e9659
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 14416 bytes
SHA-256: 102ae0886b2dca01145cf226bfbaff767900d4f4581e0e9417e9f840f01c7a05
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 17448 bytes
SHA-256: 79fabaa662d2d42239c8f8b1d10a3033b79025ba9a1e7ce903e4d35b34e630c0