Malicious PDF — malware analysis report

Static analysis result for SHA-256 703003bd7aba9257…

MALICIOUS

PDF

77.2 KB Created: 2021-04-09 17:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f92d2b8a2fd2fc87c72313772abeba1b SHA-1: 2349953c5566f604d740d6a448185e766fdc5628 SHA-256: 703003bd7aba9257ce202d6af7bce25784fafa7143410c89cebd2286f1ad0a8d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to certified mail or proof of service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=is+certified+mail+proof+of+service PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472760/normal_6064fb802127b.pdfIn PDF document text
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/jitulave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_605a0291f079a.pdfIn PDF document text
    • https://jalipixax.weebly.com/uploads/1/3/4/3/134340191/1438213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5fc85b9e8b32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_60661ef52fac1.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/4eaf9f819277.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://s3.amazonaws.com/ravuxudibure/g_s_letter_love_images.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/kambikuttan._net_novels.pdfIn PDF document text
    • http://vodipofasofuf.rf.gd/alpha_male_strategies_free.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_2892c3779cb64d5fbcdfba4aee6e8950.pdf?index=trueIn PDF document text
    • http://retiziwo.myartsonline.com/is_navy_seal_training_harder_than_marines.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_657e6264e5b249bc95a200c32ade8c89.pdf?index=trueIn PDF document text
    • http://xazopab.epizy.com/mimafalukul.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/6647833832.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_2895d40445a040d6bcb60200448c10cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/change_ink_cartridge_hp_photosmart_premium_c410.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_e420a9dfe2ab4e8190a39203037167ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/tissot_gentleman_powermatic_80_silicium_watch_review.pdfIn PDF document text
    • http://sanofuwero.epizy.com/how_to_put_trimmer_line_on_black_and_decker.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/77692355932.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 4980 bytes
SHA-256: b0e5f00449b2b0cf0b4760fda4092bd3f0256a47a29be1dd5307a1ae841def29
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10504 bytes
SHA-256: feba6c09fbf1d0c8903e3cbe44fa16bb69a49e6ace328b79a43beb6b3d7172e9
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3