Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f995095098384a7…

MALICIOUS

PDF

68.8 KB Created: 2021-02-21 16:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4078a7f7231c3a563891b1bdf28970d3 SHA-1: 728d3ed482d79600faa92ce838cdc745e48089ab SHA-256: 2f995095098384a7c538aebe5065c018ff66e904bce6f5b9b3f3427a29410811
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains text suggesting it's a lure for "vocabulary workshop level a unit 1 answers". The presence of numerous external URIs, many hosted on disposable domains, strongly suggests an attempt to redirect the user to malicious content, likely a phishing page or a download site for further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

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 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://seumenha.ru/wix?keyword=vocabulary+workshop+level+a+unit+1+answers PDF link annotation
    • http://delojenopow.66ghz.com/30479863338.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/ighbKih/29404397187.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/afughYe/my_airtel_tv_app_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/fijiagg/swat_season_4_episode_1_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/dthd1Uo/74117371025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fcaa82d02030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_6014cfc8336cd.pdfIn PDF document text
    • http://kedusigodozop.22web.org/transformers_airachnid_x_male_reader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_602035dd6d145.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
    • http://padijajuvon.rf.gd/46792589078.pdfIn PDF document text
    • http://jisufuwoj.epizy.com/kizesumivive.pdfIn PDF document text
    • http://fiwemigusa.rf.gd/bosexofadetasojap.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/evermotion_archinteriors_vol_27_free.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/38784022882.pdfIn PDF document text
    • http://femomebokubogom.epizy.com/paxamekarudiwe.pdfIn PDF document text
    • http://xenemusexo.epizy.com/welding_of_low_alloy_steel.pdfIn PDF document text
    • http://fegifujeviba.epizy.com/govuben.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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 5380 bytes
SHA-256: 0069014a222047c79bbb4a2c38d22e26f6777a1d97471017059eba5c9a2032b3
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 9932 bytes
SHA-256: 96d217e3649241f2006b950103a9ec8c89edaf4667a4af333185238b2cbf5906
font_02_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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