Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df49cf4727aee9b…

MALICIOUS

PDF

82.5 KB Created: 2021-04-09 06:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cc5c5485b9a9a74c1c2e8b8775a2d59 SHA-1: 74e9529452f13fb99af5f71aec0b45463533f525 SHA-256: 3df49cf4727aee9b32e60c52a48351b9672c39ce1207ed3d30b0cbd6a2a24bce
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/strik?utm_term=how+to+become+an+emt+paramedic+in+california PDF link annotation
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/raximajaxow.pdfIn PDF document text
    • https://datotumegodipe.weebly.com/uploads/1/3/2/7/132740351/pubet.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/english_comic_story_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488810/normal_5fdfd6414a0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_60356c0b9825a.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/3160763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fde4a9739eae.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/lufobake_sexogur_ribikejumome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fe6790a110b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fcbbedf7e0b2.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/pride_and_prejudice_full_book_read_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66e2f7ea5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fe872aeb99a2.pdfIn PDF document text
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/9220181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ae8f80-553a-4dd6-aa00-ae93862576a9/samsung_refrigerator_model_rf261beaesr_ice_maker_reset_button.pdfIn PDF document text
    • http://dawejur.atwebpages.com/kovimekobop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839dddca-2668-43fb-8cf7-ebf8a2272a69/were_going_on_a_bear_hunt_michael_rosen_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7e945d-6afb-49ea-b0d6-dc0e54e20d68/37860437383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccf0c41-716f-40f2-9dbd-08815e8a3144/ipod_touch_4th_generation_screen_replacement_service_near_me.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_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 5316 bytes
SHA-256: b4771f1b7ac955ff5160b8151aa373a1cfe479117cf8e51057126d707e7f03c7
font_01_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 11408 bytes
SHA-256: efd3c2c65375564b3221bdf4e18ee07788d5fb4af4063154273fcd0b82b5fd94

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