Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9518dde8f1c8bb…

MALICIOUS

PDF

77.6 KB Created: 2021-03-29 22:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8d0685f42f13a856ced4d61c2563eff1 SHA-1: 61e8d13ebd5d149826f57097ecad5c4da19ad6eb SHA-256: db9518dde8f1c8bb9570d76d45d6395a4edb77b1e639c7b69c2dda6eaa2e9ee5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of 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, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious 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://xezojetit.ru/wix?keyword=dawn+of+war+2+guide PDF link annotation
    • https://xojexibawetu.weebly.com/uploads/1/3/4/3/134361221/b54fdbe889.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/dogunudarimagib-sasimijiwu-xereledun.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/ada0ad4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5fe4b97d6afd3.pdfIn PDF document text
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/460bcb2e.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/aseptic_techniques_microbiology.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/mevojewinuwuxogu.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/be402741.pdfIn PDF document text
    • https://xedovederufag.weebly.com/uploads/1/3/5/3/135315932/nemopolisu.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/kovuzolivakugegipogudupot.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/kapifipalov-lanukij-zobivolo-kepowugirobun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_604604c8c0802.pdfIn PDF document text
    • http://golixudib.mypressonline.com/zinedutativutonurobosasuf.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/bandhkam_kamgar_yojana_2020_form_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/vikutotujero.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/angle_formed_by_clock_hands_calculator.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/polk_magnifi_max_soundbar_system_specs.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/bill_of_lading_air_waybill.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/lego_harry_potter_vita_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/veritujukilevasibegu.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_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 5088 bytes
SHA-256: dc4d9433cc8253d9da48473de98f7b869db374c57aa129e2b277b74d6f408a9f
font_01_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 11036 bytes
SHA-256: 16dbed4388d879cf0161549ee957b259a855ddf09b5902265dd09b56bd39ef4c

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