Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b775d672af56a9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 21:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 88778da7b9527a1926d514ad8a50b848 SHA-1: 6091ea58cf6cba586e8056d27cdf8097d5bea535 SHA-256: 97b775d672af56a99a9ba7ffebb3cd29f1db4354fbdb441b9fa3237d857dd69c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with high confidence. The primary IOC is the malicious URL https://yafferge.ru/123?utm_term=leukemianet+cml+guidelines, which is likely used to deliver a secondary payload or phish for credentials.

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
  • 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.
  • 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/123?utm_term=leukemianet+cml+guidelines In PDF document text
    • http://healthyforczechrepublic.site/14983553348skzdd.pdfIn PDF document text
    • http://magicwoolshop.com/ti_82_games_codeptyvl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411273/normal_60011a9b1ddc0.pdfIn PDF document text
    • http://xteenware.online/saditelazutigimuza75r.pdfIn PDF document text
    • http://shmelev.pro/un_papillon_dans_la_citej1cep.pdfIn PDF document text
    • http://snapchat-alert.com/code_geass_episode_guide_r22sm67.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/icao_annex_13_10th_edition.pdfIn PDF document text
    • http://comp-arenda.site/b_a_pass_hd_movie_filmywapoolgh.pdfIn PDF document text
    • http://yatvoyya.fun/little_house_on_the_prairie_season_4_episode_17_part_2bddfz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_602ff5d95b796.pdfIn PDF document text
    • http://giveaway2020.info/230368453801mry4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fda3ba1f2801.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/38304133312.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/0ecf46a5-e92c-4f48-bcc9-9e1142bd35c9/72845194408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd50128-c3a9-4dce-9410-a92445c2eff3/60993816592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe9d684-eaba-4542-973f-51f44fb816e6/95280845586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a52155-6901-4186-8884-fcdb1559b5fe/84166552624.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/nabirokad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3394f9f0-db2f-4e92-8143-05613a30b5fa/pretty_little_liars_book_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d113017f-f000-4379-abcf-1e7d020e667c/68553887233.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_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 5168 bytes
SHA-256: 90edfb93652b97220174e612b53e926bb4501a7e756153dc2a898af3633cab7a
font_01_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 11808 bytes
SHA-256: 72175c8264c010a0ca52cb86b6d1dcc1f65301e988d0eea31adc60a9939ce094

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