Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b09bc2fa3e13ee1…

MALICIOUS

PDF

84.6 KB Created: 2021-02-27 15:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a222422ab4afa83e386b0505bc0738b SHA-1: d5f4ba23dd051224ee23335aab8b3756bf655549 SHA-256: 5b09bc2fa3e13ee11b2aa1d6aa6c4f88f9526720790099480095754af4192a56
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • 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/wix?keyword=extreme+dog+fence+second+generation+manual In PDF document text
    • http://buyervannakupitvsem.xyz/express_love_to_husband_quotes_in_teluguolwnz.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/the_watsons_go_to_birmingham_book_read_aloud.pdfIn PDF document text
    • http://remastacer.com/ip_booter_2017swn9t.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/972923975632bmcu.pdfIn PDF document text
    • http://romeital.space/apology_email_for_providing_incorrect_informationo4ucw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fff35dfe6a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5fdc4b24619ef.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/woxotumomujajinegoladu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5ffc7094c3c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_60185cf3a6ad5.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/b0faac98.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/what_is_the_geometry_of_a_carbonyl_group.pdfIn PDF document text
    • http://xovonakajo.22web.org/adding_unlike_fractions_worksheets.pdfIn PDF document text
    • http://islemleriniz.org/kick_the_buddy_mod_apk_hack_happymod1r50t.pdfIn PDF document text
    • http://egrn-order.online/migivorejujexonusexabumfyfvk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizonizop.rf.gd/blackmart_app_apk_free.pdfIn PDF document text
    • http://zijodere.rf.gd/ar_15_buffer_parts_list.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/55366748691.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 5368 bytes
SHA-256: 1ecfc0a9090bf16d167ffc84efe25df3a31cfabf055b308b0d570eded9ec9240
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 1796 bytes
SHA-256: cb8590c91ef0f476e7f1000773a946dcb994e2f585eaea197fe865e273b6dea6
font_02_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 10716 bytes
SHA-256: a968b1bc7ec7adbede116fa35940022c1e68cf5050c4a98568174246272a677a
font_03_sfnt_off00012fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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