Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b0e7591f51b044…

MALICIOUS

PDF

78.7 KB Created: 2021-02-27 03:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 85f33a1b3ad88880a4bb031986f6c261 SHA-1: af436d95cd776a1b5adecb8d7065a85aecd0156c SHA-256: 77b0e7591f51b044437c6e33e12dbe980faefd4cf45aa90dae9fdc5fbd81272c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain that appears to be a phishing lure related to a hair trimmer repair guide. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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://crophysi.ru/strik?utm_term=how+to+put+a+wahl+hair+trimmer+back+together PDF link annotation
    • https://cdn.sqhk.co/wekaradukuve/SdVZha6/mejatozeranaxed.pdfIn PDF document text
    • http://rigares.iblogger.org/yevadu_song_cheliya_cheliya_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_5ff06e82dd441.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/doAhage/zanibepowepakanipakifofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_6029c6d07b6bc.pdfIn PDF document text
    • https://cdn.sqhk.co/vevodusoxif/Kjd0ggw/lynx_point_siamese_cat_average_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/25ie3Ii/27525314076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_602e66337aa7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_6032a5e71cb43.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/nonipesikiri/google_sign_in_button_style_android.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/life_inspiring_songs.pdfIn PDF document text
    • http://buxebawimiro.epizy.com/12808991493.pdfIn PDF document text
    • http://bufalirafuma.epizy.com/craftsman_lt2000_tractor_battery.pdfIn PDF document text
    • http://xonesopidazuju.epizy.com/present_perfect_tense_exercise_with_answers.pdfIn PDF document text
    • http://rumavajusugeg.rf.gd/82582984528.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/78001904955.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/p._o_full_form_in_medical.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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5200 bytes
SHA-256: d2eb256444ca9ed5320898f2cf695c9a279245363b34f2a27f4b6e7ba7c88f63
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 10372 bytes
SHA-256: 5d555a47fbf8f932a874ce90c8dceb8dbc3b62248def22039f7cd0115e3124a5
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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