Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae5de0d7f9c21d0…

MALICIOUS

PDF

81.5 KB Created: 2021-03-31 07:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1f46bbca4728be65d3a72c494b58cb56 SHA-1: 99bb4df6c69811772926300c7e8d706ecd103409 SHA-256: 0ae5de0d7f9c21d04beb8cd1d06949711e8be3c2e5d2338b72335593976ab3f9
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 as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though partially obfuscated, contains text that appears to be a lure related to 'Adj media operator bt manual'. No scripts were extracted, but the presence of multiple external URIs points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=adj+media+operator+bt+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498404/normal_603e6131d17eb.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/1iahcqE/fovow.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/gjhaifI/eau_guidelines_prostate_cancer_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5fde5892893da.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/6haKhgI/alvin_chipmunks_video_songs_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6060de9f22a99.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/hahfZtb/sawowidamilivujaku.pdfIn PDF document text
    • http://freefire-gifts.com/at_what_age_does_rue21_hire6jeiq.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/iie0EYM/20551376070.pdfIn PDF document text
    • http://gusonesi.iblogger.org/bad_blood_tuskegee_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff4d20b956b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_602a9e1b7e569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6039da63ec57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_603996ae972a1.pdfIn PDF document text
    • http://trysalon.xyz/gogo_live_mod_apk_chiaseapkkdlgz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_601c8cc871609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_602b68d75f1eb.pdfIn PDF document text
    • http://vaworudewu.iblogger.org/air_force_1_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/hwjajYg/wifi_file_transfer_android_to_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/diiz65U/wonojixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukefuxatolu.epizy.com/nuwimeledofe.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5132 bytes
SHA-256: a717c3fd2020edee04a6e336d6889f91067c87a291fc2b404e01ea3b7dd72c0a
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16360 bytes
SHA-256: ac40fe4d25a8b34ba7f0ad51cfdb2fa757f6e488c4cbeb73a17fa310ed9c6357

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