Malicious PDF — malware analysis report

Static analysis result for SHA-256 040165014eaf0d49…

MALICIOUS

PDF

91.6 KB Created: 2021-04-17 14:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1c16e828bea674c13e6f656a7953e0e7 SHA-1: 508148e3cfb9bc8eacd9804a68e5d84022511dd0 SHA-256: 040165014eaf0d4991a869a1adaed3624cbda8c233d5679a85191c443cc8a9d3
192 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, with one specifically identified as a malicious redirector. The presence of a 'download' button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=recitation+of+holy+quran+with+urdu+translation+mp3+download In PDF document text
    • https://cdn.sqhk.co/dagosasojo/jfqheji/teddy_bridgewater_fantasy_team_names.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/aieK6jb/guide_for_among_us_walkthrough_part_1.pdfIn PDF document text
    • http://7lessons.fun/96422623778jgka1.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/meteorological_drought.pdfIn PDF document text
    • http://maykistore.ru/buland_darwaza_short_information6x467.pdfIn PDF document text
    • https://cdn.sqhk.co/vusunuvaka/he1ahg9/natinexikira.pdfIn PDF document text
    • http://bupro.asia/ocr_a_level_chemistry_specimen_paper_mark_schemefhrqf.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/37735128164.pdfIn PDF document text
    • http://lnstagram-helping.live/comcast_ref_code_s0a00_after_power_outage4d6s8.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/igjhrMl/29692753921.pdfIn PDF document text
    • https://cdn.sqhk.co/vejanozugova/E5hjaLL/87099453173.pdfIn PDF document text
    • http://grandov.pro/jinubunlfsx3.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/prentice_hall_physical_science_textbook_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemesuxaw.myartsonline.com/23642902398.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/esio_trot_movie_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc2b741-3531-4b1a-90ba-a0ea2a0993a5/gezemivukodifujuwapu.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_e8c5a1dac38e4aa6891b6d9be182cdc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0995a3f-fbe4-41b6-847c-d06a24b7ec59/81848759504.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_7e3487262b034bd599b616e8c30c0796.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/964a4528-0fee-413b-81d7-fd4fea6b7c68/how_to_use_braun_digital_thermometer_with_age_precision.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/how_to_use_garmin_s60_for_running.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_35ee70e631f04ffea2806e6f50ff57b4.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012d10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D10 27636 bytes
SHA-256: c03cf9272dface115a58d7632be3c95d3f2b4a7f33940bbdace4f0da253dd4f1
font_00_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 5888 bytes
SHA-256: e66191d3856e473282cc62e21e681ceb02b642b6f01bf262d93ec51afcb68d3c
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 10528 bytes
SHA-256: 97e38e99b4510844face39b00635d0231d4027a0721389f7cefd26902ae174ff

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