Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5415a8604b46b…

MALICIOUS

PDF

89.2 KB Created: 2021-03-18 10:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 31abc0b6be7422ca9eda93edbf621385 SHA-1: 6b1447feec790ee9da81ed0a4b383f73feee9c4f SHA-256: 77b5415a8604b46bdee89e2c7709d2a5269295d26dc9c463bb1b38b2629e3962
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs and its classification as a link farm on disposable hosting indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure itself likely contains embedded JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=advanced+armor+flexibility+kit PDF link annotation
    • https://cdn.sqhk.co/tisufupujeli/Yjcibgd/50055160196.pdfIn PDF document text
    • http://myirn.icu/13567909390k07pw.pdfIn PDF document text
    • http://shop-you.xyz/the_taste_of_empire_how_britains_quest_for_food_shaped_the_modern_worldr6gqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_60123a084c9eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5fcc4c12de8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_6022bba412413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_6017a5e9c1dec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467030/normal_60080a42bbc40.pdfIn PDF document text
    • http://sollabs.xyz/nasm_study_guide_2020_freeqxt5i.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/wgjgeij/wunetevawawome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fd16f0c2f9c7.pdfIn PDF document text
    • http://musofiron.ru/sheet_street_lounge_decorlfr5m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_6005d0c9414be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_600b07c308a08.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/simujix/online_bible_for_mac_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca63026-0610-414b-8b0e-55406781aca1/kenmore_elite_oasis_washer_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6061d8e-08e4-4f76-b203-d0d0f98e12be/34122241943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce9a9c6-1ee8-4dca-b666-9751fd46f9ce/solving_trig_identities_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/wapifirebubometu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cefad24-57ce-44bc-bf33-c27660c26b09/why_is_act_1_scene_4_important_in_macbeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c6922e-4b9d-4167-b866-8fca69061615/17865783980.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_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 5200 bytes
SHA-256: feccd4844ef156a5bdde14bed30a309375411a5fabaed0c77406809875f30c0a
font_01_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 15228 bytes
SHA-256: b3dee92eb27d90114e882860d209c5ada8dbfe3ef6de8ad2aa4ca07921756777
font_02_sfnt_off00014951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14951 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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