Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb0aeb593685201…

MALICIOUS

PDF

86.1 KB Created: 2021-03-26 08:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a9d4dc509036cc48821a25fd4cf84233 SHA-1: a4ec782a9b42a433598b010e9b233b1abcdfdaa9 SHA-256: abb0aeb593685201efc0b7d16f8cc2510d33a115d7eee247cee9bb9386dd615e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to direct users to various websites. The presence of 'utm_term=android+app+development+ide+online' in one of the URLs suggests a lure related to app development. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. No scripts were extracted, but the extensive link farm points towards a campaign to redirect users to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=android+app+development+ide+online PDF link annotation
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/10ef6584d.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/bomokonivonoso-tuvubulonuxege.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/77053091677.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/wurofevosiwisuzano.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/f63939.pdfIn PDF document text
    • https://reforolirif.weebly.com/uploads/1/3/4/8/134885236/kexozep.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/52b53c6aaecf.pdfIn PDF document text
    • http://sadugumipid.iblogger.org/algebras_de_lie_san_martin.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/formation_of_fructose.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/35f62bfe.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/fozuvavamolut.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/a0921.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/57917464605.pdfIn PDF document text
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/dozeteb_vutej_febozum.pdfIn PDF document text
    • http://wajuxerisowo.iblogger.org/lg_oled_tv_55_inch_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govatojajij.epizy.com/toteziraxewekila.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_87e5c6257a9041a4a38d63294784b6a1.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_6570a9d4f37645578074dce37951aacf.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_2ecc321e5174463c9a35bae541051947.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_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 4976 bytes
SHA-256: 3f9de2f9b46411a83638776c5747d331f17de039a102ef561d07aa9577797fae
font_01_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 12052 bytes
SHA-256: dfa63e19886900769b24995a744e526d2c547deecc09f9e14bba81e57da906b8

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