Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a20d88462735f33…

MALICIOUS

PDF

105.1 KB Created: 2021-02-27 11:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6649c6f8ab74af682c469f4b483ed882 SHA-1: 0b04ba37a4c52283200958123a6089c2eda76e46 SHA-256: 3a20d88462735f337828f2d722f382a04180323240daa67710278b1852023cf4
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing campaign, impersonating Amazon to trick users into clicking malicious links. The numerous external links, many hosted on disposable domains, suggest a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/viguzus-jiwijodek.pdf.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/strik?utm_term=does+army+reserve+pay+for+college PDF link annotation
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/viguzus-jiwijodek.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/ruwamikonipefo_gabexam.pdfIn PDF document text
    • https://texodixoxi.weebly.com/uploads/1/3/1/8/131857215/gatalimigomu_telirexij_pofadixet_jusoj.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/4325822.pdfIn PDF document text
    • http://hot-money.fun/65536986268g5ln2.pdfIn PDF document text
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/8031435.pdfIn PDF document text
    • https://zapidowezagija.weebly.com/uploads/1/3/4/0/134041255/dunusimekokudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5feb24296804a.pdfIn PDF document text
    • http://circleshtang.xyz/4_pics_1_word_level_2364_answernm3ca.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/fiboj-rofeg-lugoditadedof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fcc8ed0e41ff.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/1771958.pdfIn PDF document text
    • https://bivilasafufi.weebly.com/uploads/1/3/4/6/134689398/wodep.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/a1653b.pdfIn PDF document text
    • https://negedawitadunez.weebly.com/uploads/1/3/4/5/134587096/piwudexabuzurisa.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/zatiludevebe.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/vafewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukanebesiva.atwebpages.com/gapufekebexiropidosotetu.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/gatumanewon.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/62863108557.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_off00015d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D45 5496 bytes
SHA-256: d5e36245f4a2cdf0bbf441d251ec56734b123c1f4ca586c8a55304fd6093a4e4
font_01_sfnt_off00016ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFE 11248 bytes
SHA-256: e25c079cb6d1e61a2db5045e09479e7ca1dbe32a91225454e77d500bc7937356

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