Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4133215c98d48…

MALICIOUS

PDF

77.6 KB Created: 2021-05-24 10:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1530c007266c49743893ff2cd47be495 SHA-1: e561f1271bef099d924a05dea1def156d1f091ca SHA-256: 70a4133215c98d48fc852c8ae08ced2510c4d363906b5ddd93372dd118b032cf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, including one to a suspicious domain 'botokaw.ru', suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to TOEFL test samples, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=sample+toefl+ibt+listening+test PDF link annotation
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/d73f66b6879b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_605dcb3765f63.pdfIn PDF document text
    • https://xumomeroruv.weebly.com/uploads/1/3/4/2/134266579/semisajesupulobo.pdfIn PDF document text
    • https://talasawag.weebly.com/uploads/1/3/4/2/134265385/6659042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f5b4a61cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477651/normal_60208492491df.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/kesolidesa.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/bejexe/wapotuvosebosufadugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203b631f-b5ca-4f03-8100-c6992f3c42cd/a_discovery_of_witches_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/fexumuzojigutifezurugufav.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/xirikuvejonanewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1504bf40-bcf6-478b-a1e5-e547049a7dd1/tulubadejumotisolijit.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/polycom_vvx_410_phone_warning_icon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f18b65d-fb31-4a61-877f-23eb8aac4cb8/tigerixero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f5fc17-3bb5-4b5b-9945-b00926b6e428/alone_together_free_mp4_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/jiwopuzikezuruj.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/xivevuzizowofudi.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/61440040419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0ca335-8ac2-4ffb-b994-b16c56ae10ee/juvipagil.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/40891913986.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_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 5368 bytes
SHA-256: ab5fac9e4b3717505e6e4a548dd6227c763cc2374a114cc052b4ba5207a3e13e
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10848 bytes
SHA-256: b7f86565c1ccb85b18880b8c0b1c06afd4327d6482466655c457de7bac5fb50a

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