Malicious PDF — malware analysis report

Static analysis result for SHA-256 895b2cf1a4112a33…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 00:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3f7af904e4f8c703375dc6cf0b2a4b01 SHA-1: 56214aa6fd0362274a0981b18b731b6aef93cd04 SHA-256: 895b2cf1a4112a33d4edc867c8fe45a782acd2286a3fa7a534ccb3cd44fc62e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, and contains a large number of external links pointing to various PDF files on disposable hosting. The document body is heavily obfuscated, but the presence of numerous SEO-themed links suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/award?keyword=air+cooled+chiller+working+principle+pdf PDF link annotation
    • http://resimpub.com/83921163389wvrr3.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gOrLhjr/6423038870.pdfIn PDF document text
    • http://prodson.fun/books_of_the_bible_law_prophetsd1es6.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/e0Qxdp8/dojuvomarajojupefowokal.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/8hdojxl/flying_model_simulator_free_download.pdfIn PDF document text
    • http://mikrotikwizard.com/trigonometry_problems_with_solutions_for_class_10mrk9p.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/sikudasekizabeguvatak.pdfIn PDF document text
    • http://polfact.site/washington_redskins_record_20174dqo6.pdfIn PDF document text
    • http://masajsalonunuz.com/mupirerofexinozonomenidu58wht.pdfIn PDF document text
    • http://esmoney.site/hacking_growthzncai.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/0iaZTVI/siberian_cat_size.pdfIn PDF document text
    • http://servempieza.site/zomixejebawal49z0o.pdfIn PDF document text
    • http://yoganchik.space/kvs_admission_6_class_2019_online9kul4.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/jjjhjgf/dead_trigger_2_download_apk.pdfIn PDF document text
    • http://opendouche.xyz/para_que_sirve_la_linea_del_tiempoxftwd.pdfIn PDF document text
    • http://coupons2020.info/540605623936t2a4.pdfIn PDF document text
    • http://loxuzemifa.iblogger.org/47109394623.pdfIn PDF document text
    • http://vash-fasad.live/housewarming_invitation_template_microsoft_wordruea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_bca82cc2c7fe46cab2b9afbf318fdfcb.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_cd8879d7389543a39afa4b25ee327d5f.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_e900eddbe0d041d6a8cf381ed68c72db.pdf?index=trueIn PDF document text
    • http://notaruk.rf.gd/24250526710.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_fe8c54ed29b2452b94909101c4c0b052.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_b94c1347a9304ad2b8ca03dfb9ffa43a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 4880 bytes
SHA-256: cd898d3539ccb175aed5320a6439640abea30fa21051abb5f822578ea659e9cd
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 11668 bytes
SHA-256: b4746f14555d6e55d7765e02295a1d9d7cde9c811f92bd71ccfc8da5dae333ef
font_02_sfnt_off00013b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B82 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3