Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bc4933d54e455a…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 11:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 66bb7345dcf15bde13532216eab590ea SHA-1: 91dd4d80fc5575308ce653c59df75d3e2b2b67e7 SHA-256: 67bc4933d54e455afa374c7757dd9c365c60a859c62c3271486e5fe479a43e56
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm structure suggest the document's primary purpose is to redirect users to potentially malicious or SEO-manipulated content.

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 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.
  • 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=balanopostitis+pdf+tratamiento PDF link annotation
    • http://jubigale.scienceontheweb.net/78219150740.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/05e134c.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/IMRjgjg/make_your_own_clay_pottery_near_me.pdfIn PDF document text
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/9f818.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/vopesizaj.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ibqhfic/90150378259.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/iIjgFjc/basketball_battle_apk_para_hilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/ge0hgD4/adventure_island_3_apk_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonurupadul.atwebpages.com/upkar_ctet_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/local_television_program_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/wanukatamiden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899afa3e-108a-4b16-a176-9fbe3a6a8b29/what_kill_foot_fungus.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/drinkwell_platinum_how_to_put_together.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/pdf_split_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/motafive.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/saucony_guide_iso_men_s_running_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e7dc80-9eca-4ae0-b8f6-c625e5589532/garmin_edge_510_bundle_best_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00c35fc-f72d-4401-bc71-4dbf6f136d3e/pegijefupakozedubar.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/diabetes_mellitus_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/nokakik.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/zenajilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24697178-cb30-4af1-89d4-3fc64d9c2f92/how_to_change_batteries_in_a_pocket_watch.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5236 bytes
SHA-256: cdf996ca9829045986673d1e0ef565a424872a640f4a5bb1d21c5378d33fb170
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 11512 bytes
SHA-256: 3cb156a2374d570518b63971aa3abbc4e6130413c6b492f5cb646174da6450c9

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