Malicious PDF — malware analysis report

Static analysis result for SHA-256 89241dd287d6ca86…

MALICIOUS

PDF

83.9 KB Created: 2021-03-09 21:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53d70dc9618cce0dbf3989f146b95ffd SHA-1: 3be2135fcfae0bf49fc27bc83ef5cce1a2f103d1 SHA-256: 89241dd287d6ca86437eb862d721a572624cbac00a800bbc33e771e765c60cd0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded URLs are likely used to redirect users to malicious sites.

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://resalured.ru/strik?utm_term=40+hp+mercury+tiller+outboard+for+sale PDF link annotation
    • https://xajekegok.weebly.com/uploads/1/3/3/9/133997321/lobed-bemedidulilusa-potatapad.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/0om1NzK/adventure_landing_birthday_party_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/eIhjNii/revezuj.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/0597d6fb683f7b.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/1186440.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/how_do_preschoolers_learn_through_play.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/7Wid9gh/36966256886.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwomu/YBRUiaD/bezarinatuvepelekufififif.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/zatinidixawexutaz.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/levCjdZ/82352384063.pdfIn PDF document text
    • http://jixewelo.scienceontheweb.net/45771922701.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/2731025.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/firmware_dd-wrt_no_roteador_linksys_wrt54g_v8.pdfIn PDF document text
    • http://lamozutejune.22web.org/toratonawekusemasew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_02eb8934dd754041a45cfeb2a449c63a.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_ba1042e251444162bbae657bacc3503f.pdf?index=trueIn PDF document text
    • http://tebaxisabajix.rf.gd/arcgis_engine_developer_kit_10._3.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_9b7dac7dac104f83a72483b9380d7789.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_a04e04322ea24afc8ea5a0b214f78a26.pdf?index=trueIn PDF document text
    • http://gibapomidumitar.rf.gd/curriculum_associates_math_answer_key_grade_6.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_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 5772 bytes
SHA-256: 392a55801eb839c1adb6cc8a2aabf0fad917e77df5aad2c173300e86cf461524
font_01_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 11248 bytes
SHA-256: 4ebe6be1da5f0561aa96b44195b5d07c10b024262871f7886096ed4e2c63608c

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