Malicious PDF — malware analysis report

Static analysis result for SHA-256 688add95f34e0edb…

MALICIOUS

PDF

72.5 KB Created: 2021-02-16 12:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4fbc9c2df25145fc47521a283519ce06 SHA-1: 49817b43c996cee83d8af4c1a7227c44d788a423 SHA-256: 688add95f34e0edb70a75c98452fcf9cb9886995ae90485e65d3291500486468
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external websites under the guise of search results. The presence of numerous disposable hosting links and UTM parameters suggests an attempt to generate traffic or phish for information. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=walgreens+blood+pressure+monitor+error PDF link annotation
    • https://cdn.sqhk.co/dabozijide/gemiiuQ/green_papaya_restaurant_river_edge_nj.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/rigem_fumoleju.pdfIn PDF document text
    • http://help-bluebadgecenter.com/88377080254a1f4v.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/tibWIja/z_nation_season_5_episode_13_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/ijejfaP/97095520040.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/4926619.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/8d5e8987ba5c19.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/djgibeV/space_invaders_infinity_gene_xbox_one.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/8820763.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/vabipigeti-beguxobisup-javez-wepabobowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6015e1c475eb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 5432 bytes
SHA-256: 793361ad4809bbdfefa4b7dd52f712a9771fa9fd5c4af5488dac503a52097d7d
font_01_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 10816 bytes
SHA-256: a423f602b19d3bddb4c54cbfb1fd5ac53bf9fab18b99dc4665bb5f7d3d6c4ac3

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