Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f436a2fc968c0…

MALICIOUS

PDF

93.3 KB Created: 2021-03-20 07:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0348e2f794bd6e539c21e3a59a33c942 SHA-1: d67610452e8b69ecf488a0f83c12c42eb517d1b5 SHA-256: 5a9f436a2fc968c0ba24e3d8fc343cd6c07d00fe6ec8e74e47ffce0c7ee7afc5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a heuristic identifying it as a "PDF_SEO_LINK_FARM" containing 30 external links. The document body, though heavily obfuscated, contains text related to "Balancing chemical equations examples with answers", suggesting a lure. The presence of embedded URLs and the ClamAV detection as "Pdf.Phishing.Trojan" strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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.
  • 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://jumiwimov.ru/123?utm_term=balancing+chemical+equations+examples+with+answers PDF link annotation
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/zefunilumupan.pdfIn PDF document text
    • https://vegupixusenez.weebly.com/uploads/1/3/4/3/134318628/183dcd9d32acbe1.pdfIn PDF document text
    • http://prizinsta365.site/xufivixixavotagesifojijq2ukc.pdfIn PDF document text
    • http://insitemonitoring.com/mi_air_purifier_2s_manual6vcpd.pdfIn PDF document text
    • https://rebafanivine.weebly.com/uploads/1/3/6/0/136054257/919675.pdfIn PDF document text
    • http://rollernefrit.xyz/marimjrqps.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/26369f0.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/fibebed_dewufaj_rerola.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/rogejusiz.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/3769619.pdfIn PDF document text
    • http://216tilford.com/253562435969868j.pdfIn PDF document text
    • http://usacreditscore.info/jinevelerblo8h.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/xaxumarukone.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
    • https://s3.amazonaws.com/povodijirig/nokakuwasewamuki.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/captain_underpants_and_the_sensational_saga_of_sir_stinks-a-lot_read_aloud.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/solefufe.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/toparobimuzavatasos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922bb47f-3f41-4ab6-8f05-103d80044db6/how_to_update_pioneer_avic_f980dab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4627a4f-c951-4bd9-8f5e-4494a2108e25/givibufowezuw.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/bagikewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a412ad99-f792-4c70-882b-0ee8b5b27220/richmond_essential_50_gallon_water_heater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137791a4-b67e-44de-92a7-21cd6dba5ed4/canon_rebel_xti_zoom_lens.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/23680009503.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/nerazoxamunikasupezoruxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9afe5c-0c11-482a-a708-ad032df12981/88783014043.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/experienced_hr_interview_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 5564 bytes
SHA-256: 8ba026aceddee8fc10fe88dcbad8e0485b4ddf717c339383eae1521868990575
font_01_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 11192 bytes
SHA-256: ad9ce3301569d1f962c54187594bf407173d5762b1fc616cdd80b6b0fcaa0676
font_02_sfnt_off000158e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2