Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bd116d643af1a0…

MALICIOUS

PDF

73.0 KB Created: 2021-03-17 09:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 083469d79142b44305f05e10c6b27b2a SHA-1: b17937642116f5ac4f5162b55755dfaa782e151c SHA-256: 09bd116d643af1a059f2f250fedd1125ae32db8bd11c95e981ec2ec015a347bf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=nms+surgery+casebook+pdf PDF link annotation
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/saduzis.pdfIn PDF document text
    • http://profoto22.ru/sanyo_55_inch_tv_dp554417gsjr.pdfIn PDF document text
    • https://jinimajaloxole.weebly.com/uploads/1/3/5/3/135314869/kewisorumepele.pdfIn PDF document text
    • http://montana-media.com/19231546246jipno.pdfIn PDF document text
    • http://aov.one/common_english_verbs_listwel40.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/Xijfejd/voice_changer_with_superheroes_effects_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_601ecdb043e2c.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/jfb5ngg/parentsquare_app_store.pdfIn PDF document text
    • https://xanuzelikaba.weebly.com/uploads/1/3/4/8/134889809/jebazugabolipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_5fe73d14a745c.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/UrpLLr2/xajavekufodulufe.pdfIn PDF document text
    • http://silkhfig.bid/citizen_eco-drive_mens_at4010-50e_titanium_perpetual_chrono_a-tiaam2.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/cbd4a21b5d.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/f34b90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_79cf0c7476fe467e8ad1d9f686bfba89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/simedolipepo.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_578aeb1adb354e649fa2ebae759e818b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/dolirenuzix.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_3ea5a64414b343e09051fb677b2d45f6.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_b111760545b846d3a7573b46772734ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/baahubali_2_filmywap.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 5720 bytes
SHA-256: 508f827259301a5b3867b7c8bb0c69c6b01b49102d74a6649a33ec1ca6dc885e
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 11132 bytes
SHA-256: e6f241af2022575cea90eb205f7e79f84b320b2576c1ac5e5e041298c38506ad