Malicious PDF — malware analysis report

Static analysis result for SHA-256 966b15920ada454d…

MALICIOUS

PDF

87.7 KB Created: 2021-03-16 09:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0cc45303979fe243c00191094d211f34 SHA-1: 0d15669003c0bd44c8997f122f849841581e6c0d SHA-256: 966b15920ada454d4436dd7f823fbcd8dd6a44354d7a6e320fea39c18d106824
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a common technique for SEO manipulation or distributing malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this file, suggesting it's a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=the+central+idea+of+a+speech+often+emerges In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5feb077328ff5.pdfIn PDF document text
    • http://zuxuwof.iblogger.org/3269580326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_5feaf4974fadb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_60075255e59a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gikukenal.rf.gd/bidejawovilofejogesuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f091899-65ab-4659-9507-67bbab8bc740/ruxelomikebapukavulidij.pdfIn PDF document text
    • http://dezazikep.epizy.com/55005340369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89aa1fb3-16a1-4ac6-9007-ce7a8ecf51e5/medical_case_report_abstract_format.pdfIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_4c1c15b7bece4efa9995288397b0e54b.pdf?index=trueIn PDF document text
    • http://kovewufawik.rf.gd/jesojagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8059acb9-b5ce-4e37-b707-a99347314330/how_to_reset_bt_cordless_phone.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_c2443b150d554286aa252dbfcb494fe5.pdf?index=trueIn PDF document text
    • http://sekusasumoda.rf.gd/fotebivapemopobuweweju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203028ed-bab4-480c-ab8f-bdc1fb688cb7/occult_america_mitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171e26fc-8105-4d15-9d27-9d480001212a/muwonavevozadeg.pdfIn PDF document text
    • http://wafibajew.epizy.com/59716597204.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_2ada0605aed24272a3553f5282f4f248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d233545b-e338-4bf5-b09a-d49dc4536bdd/installing_sunsetter_awning_on_vinyl_siding.pdfIn PDF document text
    • http://gulamodujanir.epizy.com/princeton_review_sat_practice_test_download.pdfIn PDF document text
    • http://kosener.epizy.com/atomic_models.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 5304 bytes
SHA-256: 4b2660b7179e7babe05e168e9b4b167048feec9d35aaf0670d37d6317cdce391
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10944 bytes
SHA-256: 9025adf1cd22f013edaf8b9e12bf038e7d8f02158326563cbc0d59856ada95ff
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00014074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14074 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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