Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2544f84250fa46e…

MALICIOUS

PDF

71.3 KB Created: 2021-03-06 10:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c64a26a781035e10e4e82a98a3b97865 SHA-1: 826c01b630c579993d57ae4f8d6783c8a6bdcd85 SHA-256: b2544f84250fa46eda092bc2dbf5d955d037aea96f305330bf47f14c30dff620
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with heuristics identifying it as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

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://bologen.ru/wix?keyword=lyrics+sweet+hitch-hiker+creedence+clearwater+revival PDF link annotation
    • https://pudefita.weebly.com/uploads/1/3/4/4/134476078/13279a93298c.pdfIn PDF document text
    • http://xojokare.iblogger.org/arnold_schwarzenegger_exercise_book.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/zedeged.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/pagepadi-burekiwoza.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/f95a1fc.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/lapode_luwitonini_dofelo_tivuze.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/g7jfHEO/chocolate_cake_recipe_from_scratch_simple.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/pimamogawisiwebamez.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/7072397523.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/hUhhicY/drift_cup_racing.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/zisopezap.pdfIn PDF document text
    • http://dupezivekiguje.22web.org/revolejokulixojajat.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/4b37350b-d881-4182-864b-879965c3dec8/samsung_p2770hd_stand.pdfIn PDF document text
    • http://dimafox.epizy.com/alaporan_tamilan_3d_audio_song.pdfIn PDF document text
    • http://rigirulame.epizy.com/menemore.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/how_to_clean_the_char_broil_big_easy.pdfIn PDF document text
    • http://judujamo.epizy.com/fishing_tackle_box_for_crappie.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/disable_google_calendar_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174619e0-ad12-4330-ad09-90fa6b5599a4/38497712061.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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 5320 bytes
SHA-256: d31d3617b2afa73c73c51b5923dcf0acd9272f10cd79a552b9b1ca003e059e33
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10268 bytes
SHA-256: d5456741e711470d5dbe7d320b57a6a6c525d96a02fe6accbed692441576e6ee

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