Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aa8198ead848eb…

MALICIOUS

PDF

74.4 KB Created: 2021-02-28 00:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a2c5c15e448453d1bae4c29e298e953 SHA-1: 0f53b098cd73ea0030d8ba6bb3663d94f76419f4 SHA-256: b6aa8198ead848eba12940578178e9f8d99f384d4c2ab942302137f89515d422
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a callback phishing or tech-support scam, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to malicious or deceptive content.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mezovuduw.ru/award?keyword=primerica+insurance+prices PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fd1b8404a6a8.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hdE0xgg/rarikupenaro.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/2iXljh9/illusion_connect_codes_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/cukhhKs/hallmark_channel_when_calls_the_heart_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/HCjg8jc/wikipedia_game_of_thrones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409819/normal_5fe4480fd017d.pdfIn PDF document text
    • http://natnat.fun/where_is_wps_button_on_netgear_r640066b5q.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/45754456602.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/ZcS8kjc/79718128575.pdfIn PDF document text
    • https://cdn.sqhk.co/takakakod/BjhIFTj/gokusufadejatej.pdfIn PDF document text
    • http://usejus.pro/h_pylori_treatment_guidelinesg0jj8.pdfIn PDF document text
    • http://kanshoper.site/127581262755g0v1.pdfIn PDF document text
    • http://motivawka.online/209696124938l7bv.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/BLvAugd/modern_on_the_rails_mamaroneck_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/apes_basic_math_skills_worksheet_answers.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/seberoposejukogaxebo.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/street_fighter_4_arena_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/42947665816.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/fumusuxezebigonuva.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/bram_stoker_dracula_movie_quotes.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/65737620402.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5048 bytes
SHA-256: 08250819e710a4b02e684b2356453fc178c5272307694f5f5c9422265e5340e0
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10924 bytes
SHA-256: 37fa80116aa5e8d712bf138dd23ef390fee9326c8273da79701606a486097b8c

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