Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba5431c03313b48…

MALICIOUS

PDF

78.3 KB Created: 2021-03-12 16:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0400f38e604a66d5dec6cd68239a3089 SHA-1: ab3b750d2519c5bae1df97611cd3dbaaa055ed77 SHA-256: 3ba5431c03313b48012ffb176caea3ec0e212bc243cb349d16510663581e6e0c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely as a phishing or malware distribution vector. The presence of multiple disposable domains further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=how%20to%20clean%20burnt%20electric%20stove%20top%20burners In PDF document text
    • http://visionnew.xyz/republic_plato_book_2hsj9z.pdfIn PDF document text
    • http://mklhhhh.space/esposa_de_genaro_garcia_lua_linda_crv663p.pdfIn PDF document text
    • http://appletopshop.ru/56613126408vbzwd.pdfIn PDF document text
    • http://normal-id.com/aws_cli_cloudformation_assume_role43994.pdfIn PDF document text
    • http://sethel.xyz/bezefawojuzp5e32.pdfIn PDF document text
    • http://eurofamily.pro/57245067533l8tqy.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/the_greatest_rock_hits_of_all_timek86kl.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/fotoji.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/d68e9dd2119e9.pdfIn PDF document text
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/3814663.pdfIn PDF document text
    • http://dresdenpharma.ru/what_are_the_rules_of_network_protocols_and_standardsllikl.pdfIn PDF document text
    • https://vufegolafo.weebly.com/uploads/1/3/0/9/130969987/gaseratewo.pdfIn PDF document text
    • http://farvestnn.ru/american_standard_hvac_model_number_search3izvr.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/6a7a96b2-687f-44cc-91be-dbaa595dfc7c/80162241656.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/bomag_bw120ad-_5_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/blood_bowl_miniatures_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44319cfc-e07c-48a6-9d79-db104dc6edd7/51853819194.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/47730928469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291c39e4-921d-497c-9176-eef1affe0060/books_like_far_from_the_tree_robin_benway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0d40a1-cfb9-4ef2-bb3b-0691185a99f1/tafseer_ibn_kathir_urdu_free_download.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_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 5180 bytes
SHA-256: 3d5c9513cc34bf5d2f43c16407a3813bb024be0ebc50e3b770644555c90b9c53
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 10236 bytes
SHA-256: 5a9fbc4b35e19e60204272a8d5dd6a80a6a8e2508eaf3e34029fb1ca6d160f3c

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