Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1a844ad0283f8f…

MALICIOUS

PDF

104.2 KB Created: 2021-04-02 04:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f22be9e5f1929ca779a613d384e8e218 SHA-1: e6b09dfff2dd6e74b36bee48ba5d27776401f631 SHA-256: 2f1a844ad0283f8f9357cd91102a92934429d11b774f1ede99244a0e953c5ad5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML heuristics flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the structure suggest an attempt to lure users to external sites, potentially for further exploitation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/wix?keyword=clarion+nz503+manual PDF link annotation
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/faxibip.pdfIn PDF document text
    • http://vuwazakuzasoz.iblogger.org/dedawamuvetorug.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/jNggahf/best_android_app_for_blocking_robocalls.pdfIn PDF document text
    • https://cdn.sqhk.co/limexofure/hgyihgi/mountain_bike_helmets_reviews_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/jejjjeP/fogif.pdfIn PDF document text
    • http://vidapabil.22web.org/84444356957.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/jce7geo/raza_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jjm7k2v/recargado_en_ingles_traduccion.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/iidF2ia/kabebetonu.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/dW1TgjI/vpn_for_pc_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/jghgiay/kebivexefi.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/Vidijid/tikujavakixi.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/jahhiiB/video_downloader_app_viral_mate_downloader.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/ghofhbQ/al_kahfi_muzammil_hasballah.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/4594164.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/K1aTBhi/1196385929.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/duwilukexilimakurodo.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/hjgepvh/20011260705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://takidodaw.rf.gd/20029315303.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/fuweviwiwokedot.pdfIn PDF document text
    • http://zetuvidofik.epizy.com/java_calendar_format_date_string.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/63970198579.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_off00015b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B70 5036 bytes
SHA-256: b0f507953b156b850b72a24130d1d1b3d5eb6702fcaba934f869540f2586c28c
font_01_sfnt_off00016c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C83 11348 bytes
SHA-256: 5628479522c98b5c7f349440e9c4bdf18f79e082fa056dac7584ed62f64d94b4