Malicious PDF — malware analysis report

Static analysis result for SHA-256 368be1a1d5552575…

MALICIOUS

PDF

97.2 KB Created: 2021-05-12 15:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9167d3d60acbd828a3ae1eafaf761112 SHA-1: e4acfbdd5a7c6d83dcaaa2fdf801ef4e5b33cb70 SHA-256: 368be1a1d5552575af1cb24392aff3241910922a63cb630022b6143bc795003d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The primary lure appears to be 'Simbologia para diagramas de flujo en programacion', which is likely a pretext to drive traffic to a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=simbologia+para+diagramas+de+flujo+en+programacion
    • http://carinsusa.info/schwinn_suburban_womens_comfort_bike_26-in_reviewadt0i.pdf
    • http://formverifiedbadge.com/30952776547bom3a.pdf
    • https://cdn-cms.f-static.net/uploads/4424027/normal_602f885ded1dc.pdf
    • http://idealicaufficiale.website/possessive_adjective_worksheet_frenchlk1v1.pdf
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/3b738.pdf
    • http://dronextactical.xyz/wutogilidobefak3cv6.pdf
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/2553695.pdf
    • https://cdn-cms.f-static.net/uploads/4495040/normal_60328d640fb9c.pdf
    • http://kartaidatodemeleri.com/57647419870rj7xi.pdf
    • http://viwiwasuzozu.22web.org/the_summoning_kelley_armstrong_series.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/kendrick_lamar_backseat_freestyle_music_video.pdf
    • https://s3.amazonaws.com/welanisowari/how_to_prepare_a_raised_garden_for_winter.pdf
    • https://s3.amazonaws.com/bifamomove/58570481952.pdf
    • https://s3.amazonaws.com/fejififimaketo/goxevemakagepu.pdf
    • https://s3.amazonaws.com/viregujipowuru/what_kind_of_anesthesia_is_used_for_surgery.pdf
    • https://s3.amazonaws.com/dazuxujepov/pdf_go_math_grade_5_answer_key.pdf
    • https://s3.amazonaws.com/sajatofubote/international_korean_lawyers_association.pdf
    • http://nowesiredud.epizy.com/bartender_old_version.pdf
    • http://dijaduluka.epizy.com/power_amp.pdf
    • http://legabukev.epizy.com/ansys_cfx_help.pdf
    • https://s3.amazonaws.com/xazarujokemus/kefejopesedul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012255.bin
3c609af13d32df00fc6b91c61d1b0ab31ff1e6303765640f955144655e4ded90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 5796 bytes
font_01_sfnt_off000135f2.bin
38598a5c079c847e22de2ef8627e0e9ab345fd89f3708750f16652aa194ae332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 12540 bytes
font_02_sfnt_off00015ee9.bin
7f851373fda98c2e325b273ef78b146b798d278201b90b183270a550c19e435b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE9 16344 bytes

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