Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7e1a9e03ca139b…

MALICIOUS

PDF

73.7 KB Created: 2021-02-17 18:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 661c2b980a366a7bce6906fbb2711b80 SHA-1: 5cf2d03d7e88874aa0af83ddd3bf373b15769578 SHA-256: 2b7e1a9e03ca139bdc377185a11f8720d841c80758b481607bfd5173a31c8c91
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to Weebly and S3-hosted PDFs, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to reference search terms related to technical writing, indicating a lure to a site like https://leonvi.ru/wix for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=mayfield+handbook+of+technical+and+scientific+writing+pdf PDF link annotation
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/xufagezajawoku-luvilamovigutis.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/fMdE0ia/25039271128.pdfIn PDF document text
    • https://cdn.sqhk.co/sofuxizago/ShejhYs/polupitit.pdfIn PDF document text
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/7a6fbd7834.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/linukebaxur_sebeduxu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/Zjahcib/53786673772.pdfIn PDF document text
    • http://dress-russia.ru/zoom_h4n_pro_review_youtubefblwe.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/nhccg5j/end_of_days_lyrics_gareth_emery.pdfIn PDF document text
    • http://crawlmqyu.space/wirifopalobirapuzosirowuhd2fd.pdfIn PDF document text
    • http://generatorsale.ru/69965661610198va.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/luxelula/chilling_synonyms_informal.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/menezamebadonojupijudakit.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/sapezisemugi.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/dejujoxorurupizil.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/somuxaroti.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/sanowijuw.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/ravokivox.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/air_pollution_measurement.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/fronius_symo_inverter_data_sheet.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 5820 bytes
SHA-256: 0f9b0bdc07e3ca0313bd7fde44761d3ee723fe79f5b2fc0ff159d89e8911f0bf
font_01_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 7700 bytes
SHA-256: 9f796ad37b099a1dda14d81d97aea9b9e6227a421054740024010b42ae4a074a
font_02_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 10172 bytes
SHA-256: a9c1cb9514c0cd1c4e9372335b7c56f15cdb9153b23af51e8528b954daf3d0e5

Open this report in the interactive analyzer, or submit your own file for analysis.