Malicious PDF — malware analysis report

Static analysis result for SHA-256 626aea041788a526…

MALICIOUS

PDF

82.2 KB Created: 2021-04-03 23:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2829bb0f08ec008581a8f4c30c932b0c SHA-1: 1dc633a6a948b63c95e7c0b446f14302bd508899 SHA-256: 626aea041788a5268cc25b3d0678e663da72ef63b72137bf4415be488f246b81
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=the+trials+of+apollo+book+3+audiobook+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454691/normal_605d99989b96b.pdfIn PDF document text
    • https://tumafivefaj.weebly.com/uploads/1/3/3/9/133999435/xomomeralur_gudor.pdfIn PDF document text
    • https://zegejuxinubu.weebly.com/uploads/1/3/4/7/134730654/vinejuri-bisunubuwefeno.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/2835454.pdfIn PDF document text
    • http://xatarekinusafo.iblogger.org/atopic_dermatitis_patient_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_603d2831d5b15.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/ziranutiwuxig.pdfIn PDF document text
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/folosuzelajuv.pdfIn PDF document text
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/mitomusakos-zekanoleje-xulakiwura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujurow.rf.gd/71016720330.pdfIn PDF document text
    • http://mopawok.epizy.com/wakodorijuzufolujirogobut.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/vufasifixowotenud.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/40927500856.pdfIn PDF document text
    • http://zagusax.rf.gd/bloodborne_chalice_dungeon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/realidades_2_capitulo_1a_practice_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/how_to_troubleshoot_insinkerator.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_1b04e3a1750347d6a0529bb536c8ae3d.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_f51fd0d4cff24282b5d65850cf5f9ff9.pdf?index=trueIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_2c982577cefd46b0a3f5d5692bbb4511.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_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 5444 bytes
SHA-256: 2ad047d32c51bc7ca2867e30b5fe896d0e615f01d4527bbafb5527fdaa1e5547
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 11252 bytes
SHA-256: a78baf33ce8a1304e30a8a1cceee44d796782f53c39241eb459a79d05925f0d3

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