Malicious PDF — malware analysis report

Static analysis result for SHA-256 22be4672feb2d7a1…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 02:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 464b8875c7e80a37d9ad7b56c125ba6b SHA-1: 4ed302fe02fc329f2ec80dc2beaf5ec39369f3e9 SHA-256: 22be4672feb2d7a13288b672ff7caa8da2d97805ac90d7df9bbf32df73ac201e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://gimoguvi.ru/strik?utm_term=they+say+i+say+4th+edition+chapter+15+summary', are likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=they+say+i+say+4th+edition+chapter+15+summary PDF link annotation
    • http://save50it.info/33536378686d0xo8.pdfIn PDF document text
    • http://koreatop.ru/how_many_atoms_of_hydrogen_are_found_in_2nh3mak59.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/wodefetazigaz.pdfIn PDF document text
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/f78592.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/eeb61a77fc51b.pdfIn PDF document text
    • http://pubggaming.online/viwamapizufasijukikavazgz4gw.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/who_fears_death_hbo_2020.pdfIn PDF document text
    • http://kevexupivuzovif.iblogger.org/72952009568.pdfIn PDF document text
    • https://rominovomi.weebly.com/uploads/1/3/4/0/134041030/xikugebasufo.pdfIn PDF document text
    • http://chelobaka.space/vigelamolbtrr.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/5424a8f6bc48a54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakogez.myartsonline.com/16828553476.pdfIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_0bb64e9a48004a2c997d985f508b07ae.pdf?index=trueIn PDF document text
    • http://jizipok.rf.gd/32276851628.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/the_listening_song_lyrics.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/bojujipexajanubetidej.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_b94e473e0bd140b8b22dcb69400e84b3.pdf?index=trueIn PDF document text
    • http://bibezakomi.myartsonline.com/how_is_time_travel_related_to_physics.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/95684538075.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_0966ef4a51df4e4c83761a930a866288.pdf?index=trueIn PDF document text
    • https://d2497fa9-5496-4194-9764-f4b168485e88.filesusr.com/ugd/eed259_0ead05e9542a451197aef57c0a0bd1e6.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_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 5596 bytes
SHA-256: 58ad64fe3c3ee908edb1e2c95418edaafd45f8a5f913f415233bb5526c7ca49a
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 10808 bytes
SHA-256: 48ac2a83575ab9a8a305db5c6b2ef1827e63bdb21492a8f6e601836c24fa005d

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