Malicious PDF — malware analysis report

Static analysis result for SHA-256 48868f174b6b9997…

MALICIOUS

PDF

84.5 KB Created: 2021-05-17 14:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 25c692cff5752bcd88b38f5b994bc518 SHA-1: c4a67cde31584474c2e07fcedbfc8979488452b9 SHA-256: 48868f174b6b9997d69178c8251b8ee3fedd139faca6d19f8112f899b8cf9dfd
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 domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'grammar lessons' and 'wkhtmltopdf', which may be part of a social engineering attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=4th+grade+grammar+lessons PDF link annotation
    • http://jadogaxarabu.mygamesonline.org/fenimowol.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/xawalu.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/rodozomerafasigisumojopi.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/jejiid2/fireboy_and_watergirl_online_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_6069ddf31e11b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5fec0e1ce9ee2.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/haCVKif/word_association_game_words_list.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/BB7Uhdk/watch_me_whip_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/iUY4hgw/najevakes.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/jbxSgdy/75956028080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421983/normal_604edf50e3d29.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/Zywjggh/subamenoviril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_6052cf74c3253.pdfIn PDF document text
    • https://cdn.sqhk.co/mesojofu/jc3Q9ic/lionheart_dark_moon_rpg.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/jjmbBtk/jasedoxobuwetoganefegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fca74e0d62fd.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/lazesej/department_of_state_human_rights_report_mexico.pdfIn PDF document text
    • http://likitaponuviv.rf.gd/adding_fractions_unlike_denominators_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/80216030690.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/edo_names_for_twins.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/prologue_to_the_canterbury_tales.pdfIn PDF document text
    • http://sinodigewenewe.rf.gd/shaw_carpet_warranty.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_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 4972 bytes
SHA-256: d41f968286c35df81534fae1f1615ccacddb43ebcc87c95efb7fc3365627679e
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 11304 bytes
SHA-256: 42afe49f65a76e5c5980a23484cbe229556fc18437a0552842c791b9748dfd3f
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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