Malicious PDF — malware analysis report

Static analysis result for SHA-256 6552c0ed1b02c696…

MALICIOUS

PDF

74.8 KB Created: 2021-02-25 07:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e2475e7b662e608dfa4c60b4bfd9837 SHA-1: 5f3ab623b4f5c354c52996de442c48645d8b22db SHA-256: 6552c0ed1b02c69641d6e7c6340cfb0899e538ca2071bb5521a5f2bf0001fd3f
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, suggesting a link farm designed to redirect users to malicious content. The embedded URL `https://bologen.ru/strik?utm_term=why+is+my+irobot+roomba+not+charging` is presented as a search result, likely a lure to encourage clicks. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=why+is+my+irobot+roomba+not+charging PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc7e451c0dc1.pdfIn PDF document text
    • http://neluvukod.22web.org/62731106847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391047/normal_60093eb2abb6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5ff30fd43ce8f.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/V2o5jal/toy_toon_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/jdd5gjc/robot_avengers_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/hiZZggS/syberia_full_apk_data_download.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/loxememorivoz.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/987a6854b0a.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/dhijc6r/siwuwewomavatifol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5ff7c8a9ec8c1.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/DtqiiMu/zilumabukepuwejefuven.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/jgVghgi/twisted_wonderland_anime_shinden.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hcLmYLw/the_tiger_rising_chapter_5_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jVJiaJs/virokipakiwafaxemorufogat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perotufusutukes.epizy.com/chest_guidelines_massive_pulmonary_embolism.pdfIn PDF document text
    • http://fufinekudag.epizy.com/fungi_as_biocontrol_agents.pdfIn PDF document text
    • http://botamokawafaj.epizy.com/sust_admission_seat_plan_2018.pdfIn PDF document text
    • http://degepedafapuf.epizy.com/51592200701.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5436 bytes
SHA-256: da7bca679bedf337057f64836e45685ea15120683c5cea70ef02a09d2b70b9d8
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 10516 bytes
SHA-256: 51c449852688c45b65b175f42a5c9db5e9837a20080fc377cea2f1d2a4e88af1

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