Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84407c9d6e4bc7d…

MALICIOUS

PDF

78.4 KB Created: 2021-05-27 21:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f65c38ad501acdcdcc9a7bb7e31afdd SHA-1: daa017a3713ae04f632efc78adb5aebf7c4d97c9 SHA-256: d84407c9d6e4bc7d2ab34a85ad76f256c5fe47d1bce8b1ce2730030e46997ef4
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=border+light+apk++for+android PDF link annotation
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/sotevosasaveluvum.pdfIn PDF document text
    • https://fuwanitawoge.weebly.com/uploads/1/3/4/4/134436239/giwuvofedudi_zanefeduje_godajuvi_tazazidaguz.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/7884b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_6004c04e67b66.pdfIn PDF document text
    • https://xapofesifus.weebly.com/uploads/1/3/4/7/134749636/bufil.pdfIn PDF document text
    • https://jatekokem.weebly.com/uploads/1/3/2/8/132814322/7190957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444646/normal_6061adaf14735.pdfIn PDF document text
    • https://sufivelogazawe.weebly.com/uploads/1/3/4/6/134600369/papisalipivuv.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/b6efc53e-3f67-4480-a791-c0b40ef57bd6/used_life_fitness_cross_trainer_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f533fe-3fb8-49c8-9843-75820a0731c0/88340463987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a985d073-b297-43a4-93f2-4c1098478860/58605410734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668aaff8-720d-4e75-8ccc-e91a1dc3ce93/29592447286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b64960-b0f2-4382-9633-5b0d29bfa0ba/bakefumalumig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598025d6-5056-4538-b522-fa773c80eb58/what_to_avoid_on_the_dash_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2d88f5-c181-418e-8e6f-5617e95a1458/79402531857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade1b4b7-6614-4ca7-af1a-77f0a8e2694c/how_long_do_you_cook_whole_sweet_potatoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807565f6-e7cc-4595-bc46-fba6247e4acd/how_to_make_a_line_6_amp_sound_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1ac1f7-1bc7-4917-8e06-67b35b8edd49/what_are_the_5_leadership_styles_in_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988c9345-055f-438d-8a22-d3a4c6e97912/logitech_g710_media_keys_not_working.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 6588 bytes
SHA-256: fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 5236 bytes
SHA-256: b7b1c00126b7ffa1549834bec545b98d90bedbad343a7f464ab9583085dc0731
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 10816 bytes
SHA-256: ccaf8a93279e95c5ca20535fc4618f76919bc506cd4de2d2a61e6a9841018d6c