Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae0ba2319d71c0e…

MALICIOUS

PDF

84.3 KB Created: 2021-02-20 05:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a701d628708ac5be9ac943fedfc34721 SHA-1: 849b6a7de6c7e16be71685a955d731a6ceeb9e39 SHA-256: bae0ba2319d71c0e3a122fcc13748122f2bb8facdd52ab1f0db21087fe105a37
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 0.9997

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://bologen.ru/123?utm_term=sonic+breakfast+burrito+nutrition+information PDF link annotation
    • http://tunulawofu.iblogger.org/an_anthology_of_short_stories.pdfIn PDF document text
    • https://kakujaboregoj.weebly.com/uploads/1/3/5/3/135341432/1301573.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/poruvotor_fivepumuk_pojavewavu.pdfIn PDF document text
    • https://bupowuxa.weebly.com/uploads/1/3/5/3/135317106/4639254.pdfIn PDF document text
    • http://zaralutodunuwa.66ghz.com/end_of_school_report_card_comments.pdfIn PDF document text
    • https://sazunanul.weebly.com/uploads/1/3/4/4/134488017/zebuvozuvokevup_sodis.pdfIn PDF document text
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/a3365a7571.pdfIn PDF document text
    • http://datujizid.iblogger.org/relikifiboloro.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/8609767b92623f.pdfIn PDF document text
    • https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/delupadibotemofot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasizekid.rf.gd/speed_queen_commercial_washing_machine_parts.pdfIn PDF document text
    • http://tapomizo.rf.gd/77660249396.pdfIn PDF document text
    • http://burorapifavak.epizy.com/vobuzinuxowi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001195a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1195A 23924 bytes
SHA-256: 8db7130a261010d4c91918c1a5448619861fce61eb413ba471c21e67da166d35
font_00_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 5304 bytes
SHA-256: 83a753038c993fced064fdbd641fb37aabd79785f80c01c49cdfa1b72320876c
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 10792 bytes
SHA-256: 12ae48f81671a573b05906ffae85bf712800afd673ce86d9f1d30b881e1b58a0

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