Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d57afa46a99c9…

MALICIOUS

PDF

77.4 KB Created: 2021-06-03 07:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32189bc53fd8491c1de276fa52f91bea SHA-1: 69c2333b4f1796995fffa4e80e6c14d2ba424516 SHA-256: 4a9d57afa46a99c9e905f1d00093a54d6cfde8339392e73c589b0161b5f32531
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. While the document body is heavily obfuscated, the presence of numerous external URLs, many hosted on dynamic DNS services like Weebly, suggests a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cdn-cms.f-static.net/uploads/4423471/normal_605a735e7793b.pdf
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/gaxofaxemol_pufekolibiduji_babetenef_dikowa.pdf
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/1603842.pdf
    • https://cdn-cms.f-static.net/uploads/4380705/normal_605bf42cacee8.pdf
    • https://betogazubi.weebly.com/uploads/1/3/4/7/134768910/durugowuwepugitog.pdf
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/julofipizixiwub_rewimomu_lowibif.pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_6017dbaa3f0a7.pdf
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/2612413.pdf
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/luvejafofopilat_wuleti_doxizaruriz_xebosure.pdf
    • https://cdn-cms.f-static.net/uploads/4404503/normal_60259a222037e.pdf
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/melofen.pdf
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/kijorita-mumoxifavore-rolokapizezida-dogadodiw.pdf
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/dccd7c1c67e429.pdf
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/xufit.pdf
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/854746.pdf
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/bafobosem.pdf
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5ff24af93c66f.pdf
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/93e9b.pdf
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/e1d75454f95.pdf
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/4b37e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=the%20wisdom%20of%20insecurity
    • http://gijorugisaw.pbworks.com/f/91171032973.pdf
    • https://uploads.strikinglycdn.com/files/a9229cfb-9a97-4964-9de3-df407b14691f/how_many_hydrogen_atoms_are_in_4_molecules_of_isopropyl_alcohol_c3h8o.pdf
    • https://uploads.strikinglycdn.com/files/3bb6c5f3-c225-4f53-ac64-037bba1f10da/gefotubowabuj.pdf
    • http://pimepovume.pbworks.com/f/fox_mecanica_dos_fluidos_download.pdf
    • https://uploads.strikinglycdn.com/files/00934e1d-ac94-4090-af86-30670056ae95/how_to_thread_an_old_singer_sewing_machine_bobbin.pdf
    • https://uploads.strikinglycdn.com/files/6c0dadd2-9d38-4c67-8a13-afdb838b9001/convert_midi_to_wav_ableton.pdf
    • http://bovozajezo.pbworks.com/w/file/fetch/144439617/android_5_for_samsung_tab_3.pdf
    • http://gepefupugalu.pbworks.com/f/jazz_piano_beginner_book.pdf
    • https://uploads.strikinglycdn.com/files/6443bc94-baa8-49a0-95a4-a29df79f6f83/12752967247.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f221.bin
6eac8dc36b67f7b8cbd7fae59e561563bd82617202f4822e7f5de2a9a920cb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 5160 bytes
font_01_sfnt_off000103a2.bin
90ab400f2d855c7b5c767097029804e2063934dbc5506eadeb47c235eec2b58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10636 bytes

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