Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a527cbf0b6ed5b…

MALICIOUS

PDF

81.8 KB Created: 2021-03-10 10:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f761c229ecfd50699398287d51c832e SHA-1: 95a505495b79ff25e24d03bc220ba9a212d5197e SHA-256: a5a527cbf0b6ed5b9c2bccff39607fedcbd19b85da7c15b46bcaf8543bcc4897
186 Risk Score

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 0.9991

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://zajinet.ru/strik?utm_term=will+verizon+prepaid+phones+work+with+straight+talk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5feed76b34d4e.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/penisij-xiferuxojil-setujipu.pdfIn PDF document text
    • https://pupokidam.weebly.com/uploads/1/3/1/3/131381904/tepav-solavuvaxilu-pijilevavafoduz-doripowuxisim.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/abf9992a5cba0.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/5605939.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/dipuwirimitedokasa.pdfIn PDF document text
    • https://kanexunife.weebly.com/uploads/1/3/2/6/132681916/bovekowixoliro_xagafuwu_rojalolepubat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_602ea91607f86.pdfIn PDF document text
    • https://xukobali.weebly.com/uploads/1/3/4/8/134882082/8967eb.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/govevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_6041609eacc9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/63e1390d-f0b7-4469-bb8a-44d3b3502c9e/pipavurixegitukaked.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/sokareg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c31e42-ec38-4961-90af-94861178cbe2/jujutovopiwugexe.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_64389700c1d04af1a1a83bbb58296791.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_5d70e04e14284087bc7e09ca98826085.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8ae285-afaa-4107-8af8-63e1912da970/sociological_imagination_examples_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/relieving_letter_format_in_ms_word.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_794885486789425ba70f54ed47806736.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/weroramovimimiwasikiba.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_29e1ccaa689a474383e09e32f301d8c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/apostila_de_analise_sintatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fffc030-ac5a-456b-bce3-0932a43a3014/how_to_connect_usb_in_scv_set_top_box.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5288 bytes
SHA-256: d5f99342340b38bc4e55e2c888ffafb1c8df58cc68b90aa98871d1739c5af977
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10944 bytes
SHA-256: b7f17f3bba9740b97a07ab3465ab4409a8e68fc0e9a71155e9ad8d884476ff5f
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c