Malicious PDF — malware analysis report

Static analysis result for SHA-256 77847f7e5d25c265…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 01:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7507fe7b6cf37847b2bbeed1552f35b SHA-1: 29be2c87076b62dfbbca6ef0d1c8ff48352645d5 SHA-256: 77847f7e5d25c265feff7dbf9e388f8f5e0e737d55602c044df0d2d3b31b721f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The embedded URLs and the document body, which includes a misleading title, suggest an attempt to redirect users to malicious or deceptive content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://dafemum.ru/strik?utm_term=leche+materna+primeros+d%25C3%25ADas+de+embarazo
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/nesojuvonani_kopuselodewi_taravoxoriro.pdf
    • http://tepugorotewole.medianewsonline.com/81664059778.pdf
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/xitozo_wavamim_zugabujejofobu_dubanu.pdf
    • https://cdn.sqhk.co/wugoselubiki/heiboCz/41367710508.pdf
    • http://tuvivukaroj.mygamesonline.org/vuvajoruw.pdf
    • http://xuzevofut.22web.org/23887859435.pdf
    • https://giwemonuxir.weebly.com/uploads/1/3/0/7/130775654/4670917.pdf
    • https://cdn.sqhk.co/mevazasid/iVjigeO/can_you_use_game_genie_on_nes_classic.pdf
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/6611439.pdf
    • http://vagesibakizame.iblogger.org/cross_cable_color_coding.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molagegivijoxu.onlinewebshop.net/hitachi_c10fch2_change_blade.pdf
    • http://zunijakokusageg.epizy.com/net_framework_4._0_for_pc.pdf
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_90e90eb3089e44ea87fc484898d3fc22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5efaaad-4ce3-4b36-b4d1-ce2cac4489f3/tigobo.pdf
    • http://pevogikuxupeja.onlinewebshop.net/53424796401.pdf
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_b52def7620324bccab885296c980dec9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/841576f8-5bcb-45be-bd2f-78d2e853e94c/project_manager_salary_in_atlanta.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8048c4fbdab042b0a377c77f8b8526d7.pdf?index=true
    • http://purokazurawilew.rf.gd/facebook_apk_for_iphone_5s.pdf
    • https://uploads.strikinglycdn.com/files/c47febef-972c-434e-9d5e-5602b7158761/historia_natural_dela_enfermedad_dengue.pdf
    • http://rixuroruwe.myartsonline.com/marketing_plan_template_google_docs_free.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_off0000fb28.bin
7bd10a5caa7adab2fd55c174c846f9cc74679927e16c18e27270d3d105f4c5d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 5464 bytes
font_01_sfnt_off00010d93.bin
2ef03c1028a850c62709860e21b5459195a0211d86f35c945df55473466564d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 12640 bytes

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