Malicious PDF — malware analysis report

Static analysis result for SHA-256 41939761695c0727…

MALICIOUS

PDF

115.0 KB Created: 2021-02-25 21:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ddf6e595ca43a46dc56cc3ad061e461b SHA-1: 0f5ed09779858113ec9ea670816a2a6fc9e0eb23 SHA-256: 41939761695c072797168fbebdb70c3ced9c050fedf407c3e8372da5ec3f0b73
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 multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to historical events, likely used as a lure to disguise the malicious links.

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://leonvi.ru/strik?utm_term=how+did+hitler+rise+to+power+so+quickly PDF link annotation
    • http://sezugoramilepep.22web.org/anthropocentrism_vs_biocentrism.pdfIn PDF document text
    • https://pekosorevonoxa.weebly.com/uploads/1/3/0/7/130739373/7560821.pdfIn PDF document text
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/zobujajuboxoga.pdfIn PDF document text
    • http://dafujopinax.22web.org/how_to_find_velocity_at_the_highest_point.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/2055296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5ff8f496db390.pdfIn PDF document text
    • http://yewes.space/novation_launchkey_49_mk3_priceokw8s.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/great_northern_6_oz_popcorn_machine_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_60339435b674f.pdfIn PDF document text
    • http://pe50off.info/account_sheet_in_exceluq31r.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
    • https://s3.amazonaws.com/nuxomigo/27407950729.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/88833243099.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/aadukalam_songs_masstamilan_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/android_store_data_in_phone_memory.pdfIn PDF document text
    • http://gevosumol.epizy.com/47899801055.pdfIn PDF document text
    • http://fosekor.epizy.com/website_templates_free_html5_with_css.pdfIn PDF document text
    • http://batubegirego.rf.gd/32967305496.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_off00017aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA0 5072 bytes
SHA-256: 6173f0b5919b0dc82dfa7916a9beef131647f013a5c95779dcd9d37cf0b7f283
font_01_sfnt_off00018c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C0E 10556 bytes
SHA-256: 3dbe6dd98339a3b8eb1d1228492a96d58313466f683e0f05bf83ab1f928897c2
font_02_sfnt_off0001b040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B040 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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