Malicious PDF — malware analysis report

Static analysis result for SHA-256 b018bf727fa495f8…

MALICIOUS

PDF

73.0 KB Created: 2021-02-18 22:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84e98a04cc00f3d5b4f710b349c5356a SHA-1: 78ad9f15d13881faac4b3e7a2cd30f64bf0e17f8 SHA-256: b018bf727fa495f84e794cc26f58c9e35d3c7faf4d6d7ec2da3af5b44600cc84
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=what+is+the+septuagint+in+the+bible PDF link annotation
    • https://cdn.sqhk.co/lukedivibeb/fBifjdd/79308544723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5ff05b538a64d.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/49b62.pdfIn PDF document text
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/wapowaguzubet.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/4474883.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/jGN3ia1/rock_radio_stations_dallas.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/0ggjgji/ruwikarafaxajiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fded46a3b4b1.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/gjhjhiV/87255492415.pdfIn PDF document text
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/rivogutuvumozutuveme.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/e7qjc90/guvejatodunawiw.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/Yhajjhh/jogedekaxonagafimofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligumawi.epizy.com/birthday_song_with_name_maker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/lelobe.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/les_accents_exercices_cm2.pdfIn PDF document text
    • http://zepizokuxufo.rf.gd/which_of_the_following_is_not_an_example_of_an_internal_recruiting_source.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/arcade_game_for_windows_7.pdfIn PDF document text
    • http://pidejekakej.epizy.com/64596321087.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/destiny_2_hunter_class_guide.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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 5136 bytes
SHA-256: 1b862bb806d821a62cdbb8f411351fc443878c2d972acde3b5e1ee3a7b75d7cd
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10888 bytes
SHA-256: a9146672ea1e0806ccee95fb56c2b086d2afe9ad9cd0b734878be563f5a1fab6

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