Malicious PDF — malware analysis report

Static analysis result for SHA-256 78178ed1a5edfce5…

MALICIOUS

PDF

75.8 KB Created: 2021-01-23 10:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 36c11c876c5f4672fdc537c3eb2e1596 SHA-1: 4e69a74643fb6bf2877d681faee6b2c8a41662c7 SHA-256: 78178ed1a5edfce5306dbfb7fee74ec3c783b2b94ee42360d34959828f1158cb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed 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://traffnew.ru/aws?utm_term=optional+backshifting+reported+speech PDF link annotation
    • http://fisifur.iblogger.org/english_nouns_verbs_adjectives_pronouns_worksheets.pdfIn PDF document text
    • http://zivudib.66ghz.com/never_be_alone_piano_sheet_music.pdfIn PDF document text
    • http://kemotunitajifap.iblogger.org/73914221989.pdfIn PDF document text
    • https://site-1168252.mozfiles.com/files/1168252/10587719014.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/titevi-nupexobili-jabekozona.pdfIn PDF document text
    • https://site-1178342.mozfiles.com/files/1178342/slideshow_template_after_effects.pdfIn PDF document text
    • https://fabexitib.weebly.com/uploads/1/3/4/1/134109013/juxesutixedu.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/7138045.pdfIn PDF document text
    • https://wibejimexog.weebly.com/uploads/1/3/4/4/134466339/kelejodol-jitupifive-padisoluxiwevus-venadobef.pdfIn PDF document text
    • https://site-1228067.mozfiles.com/files/1228067/go_math_homework_book_4th_grade_answers.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/firojirero_betinij_zosodilozonetim.pdfIn PDF document text
    • https://site-1239377.mozfiles.com/files/1239377/jomel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linakagiwabofa.epizy.com/32340623619.pdfIn PDF document text
    • http://bowupezik.epizy.com/96536081749.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/40471111537.pdfIn PDF document text
    • http://fewetero.epizy.com/household_budget_template_free.pdfIn PDF document text
    • http://gerosopidazab.rf.gd/copy_sheet_trong_excel_vba.pdfIn PDF document text
    • http://mowesedapi.epizy.com/bantu_education_act.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 5648 bytes
SHA-256: 72fc28bf3edc1e797d7a917e882c40f161a299e39e5c7e48c57bd6e3f8801245
font_01_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 10228 bytes
SHA-256: 1ba5983a967eef2abd13674d821ec1c3a1a764fb3a423c3d0a448bdbf58a49de
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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