Malicious PDF — malware analysis report

Static analysis result for SHA-256 47111d30f7b6d3a8…

MALICIOUS

PDF

71.4 KB Created: 2021-05-13 07:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 31074509033de4c130b389b39e6587ac SHA-1: 070e35f327d619159cd1d6c2575ea1d7a1d2c5e3 SHA-256: 47111d30f7b6d3a8717ec096cfeabab3df41d2ae222ba8c463969a7c97df0c2c
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The document body, though heavily obfuscated, appears to reference academic material, suggesting a lure. The primary malicious URL identified is https://lozipotod.ru/strik, which is likely used to host a phishing page or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://lozipotod.ru/strik?utm_term=calculus+early+transcendentals+8th+edition+james+stewart+brooks%252Fcole PDF link annotation
    • http://nemagufi.mywebcommunity.org/lejamatanigepovuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_603c168eb9bf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fc684986f626.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/pectus_excavatum_adalah.pdfIn PDF document text
    • http://wowit.pro/al_mughni_book33kjq.pdfIn PDF document text
    • http://siondez.ru/8187190359115cgs.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/adjective_phrase_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_60405566e61c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_fae9f5cc91194f63936cf706acd69e85.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_6f43c6c41f994c5f8c75ad5248d9656c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8490a4-151b-45d0-b982-49a4a8e4c982/31369485513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4ff6ac-f5fd-4681-9f8f-eb324cf66f01/what_is_the_sum_of_infinite_geometric_series_3_4.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_11bc8156ca254c16ae4d8810edd5c177.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_9319ed0644a448d78a15bbc1fe6a3ba1.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_d68130aa41644ae193946a7a17fb9790.pdf?index=trueIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_2c11a1ff7cf24ecbbfba213978afc6e7.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_f70d8bdc3f334c299bd8dfdd78e261c2.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_3f1c87cfa13d4e578cf243d4ea5be963.pdf?index=trueIn 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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 5788 bytes
SHA-256: ad6a46b59cfddcddd398c9f571fc082e53028eab06df95c778a36da1fbbfb370
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 11324 bytes
SHA-256: a8c6319138d55d683917f4e7a2007ada697f9ee66f225c510ea46670500737d5

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