Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9b07a2e100affb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-10 17:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3793609b42386213840a6dbe1a18480a SHA-1: 8f37df9e49f1efc47040aaab743a8269dae4b60b SHA-256: da9b07a2e100affbee6a531ab0dbddeb863f134aea63172843636a3b04270b58
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm for SEO manipulation or to distribute further malware. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kuzutuzo.ru/wix?keyword=watts+to+kgm%252Fmin+conversion PDF link annotation
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/wejavobug-dexunaxopiwo.pdfIn PDF document text
    • https://lutilizifaguno.weebly.com/uploads/1/3/5/3/135316604/224357.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/vogag.pdfIn PDF document text
    • https://kurisakon.weebly.com/uploads/1/3/4/5/134504438/6724778.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/mezofure.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/vigiriwara.pdfIn PDF document text
    • http://nawabopebi.iblogger.org/finezipitat.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/kijanifo.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/numafe.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/2cda668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/dusk_diver_pc.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_17a5420fd96b4d02b95d2282b8ef3e87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusone/call_of_duty_zombies_obb.pdfIn PDF document text
    • http://dagalukuxi.rf.gd/englisch_bungen_verneinung_simple_present.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_9f0fc0a2468f43e0a2109b563e63a408.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a023b4-d6a2-4544-b66c-b835002dbea2/5272671887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b5b5a7-0e6f-49de-888e-0feb0a937705/58064528505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4206eabe-2177-485d-b7b5-a1adda328651/27397033547.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_a805a709870542c1b670e6dc487a57a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6090c17-b66b-4919-b015-896279887599/rumavuguburukule.pdfIn PDF document text
    • http://notewewagegev.rf.gd/timmy_trumpet_freaks_flute_sheet_music.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/86033980133.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/heat_and_mass_transfer_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ab9ccd-5492-4c9f-b4cd-63b5b6a7f284/86801919520.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_63b7bf311edd488ba9e99048bcf828c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/autograph_tamil_movie_full_hd.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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 5260 bytes
SHA-256: 7d97442ab9f95460ed1d4769fb478a6e0fe15e3da43fe65b453a18c3e8fe9a52
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10868 bytes
SHA-256: a5c09ec35a7765fc7de4d27ffa2a50fd754b8cba69c39aba35dda4a108d3c352

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