Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f44c83a61a09dda…

MALICIOUS

PDF

107.2 KB Created: 2021-03-13 20:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0466870b127cef7c018c78b505c97561 SHA-1: 4a0e9a2397b2b3c4e67f6c580905c6e9832c9945 SHA-256: 1f44c83a61a09dda2d9605e766b61bd5112003b7c3559d6dfe98a833128d3171
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery mechanism, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=acknowledgement+format+for+industrial+training PDF link annotation
    • http://erethiztzj.space/types_of_drag_in_aircraftwexz8.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/bimefekupi_dofubusug_kilobeveg.pdfIn PDF document text
    • http://notdull-eng.online/daromopunelojuzefidknm9x.pdfIn PDF document text
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/1a9efd.pdfIn PDF document text
    • http://bluebadgeapproval.com/download_primal_carnage22iic.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/jokota.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/jaxoroxab_jatilijuxuvawa_jigonogik.pdfIn PDF document text
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/mozokoloseti-feligaxarid-milogajowarani-jepobad.pdfIn PDF document text
    • https://rasogumelix.weebly.com/uploads/1/3/5/4/135400304/01ecb3f83a5d9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5ff264bcc32cb.pdfIn PDF document text
    • http://autokenn.com/go_math_grade_5_workbook_online1o43t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_60462451bf4ce.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/4fb789c185.pdfIn PDF document text
    • http://7lessons.fun/88978617195hnt0u.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/gebofurikesox.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/685bf9b59d4973.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/b380f6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c843881-b1e7-4033-afc2-e994125dd2ff/can_you_cancel_sat_subject_test_scores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c72cc82-0ff0-4977-a22a-e780f8bb0eb0/night_shift_cast_season_2_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6e2060-0cf3-48ac-81df-becde9cf9ac9/how_to_set_the_time_on_a_krups_savoy_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abd7495-e5e5-4295-b047-c7e53d60140b/how_long_to_fall_400_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adeee615-0221-40e1-b0b8-c27546afbbc7/25344071589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98862e4-399f-48b9-ae78-520d3bee7ac5/meade_lx200_8_schmidt-cassegrain_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a449da5-c3b0-416b-a966-85ee0f5913e8/16286405008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6b7779-2769-4f4d-966d-b7d071678cda/can_you_bake_in_a_copper_chef_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd52ae7-0917-4e78-970c-9d128f8201d8/atem_setup_utility_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5706928e-c6fe-434e-8dca-2810e541ffba/have_the_relationship_you_want_ebook_free_download.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_off000166d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D7 5484 bytes
SHA-256: 209a9f0b807903dbbeeb8ef86e0f826d6b5bd2e4a712b1ec1d50a7368e7b8939
font_01_sfnt_off00017985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17985 10912 bytes
SHA-256: 51903d57183280e954a6672097fae4829fae49bcd5610194f13ed90dc9dc5bbd