Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ddb18155f5da1c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 18:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d24176ecfd444ff7d2b424154c136c8 SHA-1: 589a7e00d52938912997e77edfea4ca541a7d1bf SHA-256: f1ddb18155f5da1c28e60b465831ef08467d1a6b656cf38f09d26a35d6364c04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/wix?keyword=chemistry+crossword+puzzle+answers+top+30+elements PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6045f29139b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_5fd9a928e3d86.pdfIn PDF document text
    • http://pay-order.info/can_you_study_for_cfa_level_1_in_3_monthsvh2jh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_603f16507f86a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5fc9d30c583bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5ffe45739b450.pdfIn PDF document text
    • http://avit0.cc/the_gender_secret_wikipedia9nqr8.pdfIn PDF document text
    • http://theandyhong.com/sebuxiwasetowomugxfbi.pdfIn PDF document text
    • http://gesizuwumog.iblogger.org/exercise_lower_back_pain.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/algebra_nation_section_1_answers_algebra_2.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/call_of_duty_black_ops_1_apkpure.pdfIn PDF document text
    • http://roduteberilexel.epizy.com/9562390560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024ed398-c91d-444e-b9b5-3efa036c5ea2/40972253272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbec9219-b272-48ba-bd5b-14c23177ec69/cnn_live_update_on_us_presidential_election.pdfIn PDF document text
    • http://baponexar.epizy.com/60320531407.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/rpg_character_backstory_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bee0b9-0b9c-42fc-bafd-734e8285b444/marie_lu_legend_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d18b3b-fc0d-4518-a7f2-618d90cda30b/how_to_fix_vertical_lines_on_panasonic_plasma_tv.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/advanced_christmas_piano_duets_free_sheet_music.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 5768 bytes
SHA-256: 487f83568de0b4727b46b33d61a796c2c5591ca1a967643add17edb29f405bf8
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 10612 bytes
SHA-256: 4588d94aca89aa3e7742a25e399517fd6c3c8acb23aa5ffb6c6b2726474b28aa

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