Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1de8d90c8bf0c19…

MALICIOUS

PDF

78.4 KB Created: 2021-01-18 09:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a8b27f9db07c6f609aa87e1041d3e934 SHA-1: faaa996c1e58ff74702c87f4e9301c31c60d57b4 SHA-256: f1de8d90c8bf0c19a87939d00e6715c2fcfa82b9df2341afccf785e17c0fa87e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'school calendar' and 'wkhtmltopdf', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/123?utm_term=aps+2018-19+school+calendar PDF link annotation
    • https://cdn.sqhk.co/sejixikerut/ibjaX0F/kotawedibedejeku.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/jfCgjgc/cartoon_falling_sound_effect_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fe4805d9e61b.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/cejbhF6/class_10_maths_rs_aggarwal_solutions_chapter_11.pdfIn PDF document text
    • https://site-1223962.mozfiles.com/files/1223962/file_khng_in_c_2_mt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f9a1d82a2cef.pdfIn PDF document text
    • https://site-1178723.mozfiles.com/files/1178723/jayco_propane_regulator.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/eLjaHhc/61917190035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5fc2a788d6d79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5fe2cf79ce232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fccea301ce30.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://deroselewem.epizy.com/antivirus_free_for_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/reddit_summoners_war_db12_team.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/usamega.com_powerball_jackpot_analysis.pdfIn PDF document text
    • http://gexazavere.epizy.com/ectopic_pregnancy_guidelines_uk.pdfIn PDF document text
    • http://xenivut.epizy.com/gaxigukozij.pdfIn PDF document text
    • http://losuwanawore.epizy.com/fexajas.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5520 bytes
SHA-256: 93fc1b711b449750ed80456ecffe98f2b2345c012ec30e7129fc205eb3d93e35
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 11668 bytes
SHA-256: d2aff881179b5dfc668663288f7d0aeaaab493e5cda736d6ade1a76496909939
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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