Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccbe656b3a6ca23…

MALICIOUS

PDF

73.8 KB Created: 2021-06-01 00:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 122dfe8c76b1418932aead908a906003 SHA-1: b19d70ea021ebb5a6419c4bbf56bbb0660a0e89a SHA-256: 8ccbe656b3a6ca235b4db9401fe9dd92086466c72df682456b9998ac88efd249
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'synerhu.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'fundraising thermometer graphic', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/pbw?utm_term=fundraising+thermometer+graphic PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4443578/normal_60afe8ed21891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_6038962a5539e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_605d748f6825e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/f/the_private_diary_of_a_life_interrupted_free_download.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144428229/canon_lbp6000_lbp6018b_driver_download_windows_8.1_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685a6eeb-cc0d-4f40-804d-0dd89ae4d745/72034548842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4269616a-22dd-46f5-8f21-d0b66e669cf0/what_is_critical_reasoning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ed3dc3-75e2-49c3-a321-7673b3dccf5e/where_to_buy_fly_tying_supplies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fd100d-2799-4ce5-b5e5-1a0a2d64dfff/genet.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428454/bavasojedewukijaxot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb71061-539a-4ce0-84fd-ae8c2ee817ce/does_the_military_lift_weights.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/69875352649.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428070/8676377527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2f0043-bd4c-4f20-8ab8-a85a67d2fd72/57876448236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e3f6af-35a3-4e09-9dfc-b81044a05447/how_to_curate_your_perfect_capsule_wardrobe.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144424791/ill_be_on_my_way_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1934ccc2-f44f-4306-ae41-07813c2909c6/ruger_sr22_upgrades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efc383a-bc39-4382-a1e4-8fff1e641d30/56291723167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d19271-46d3-4f30-b619-44e5dbc3657c/jefutubivudebaroleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27f31e1-88f0-44c6-bac7-197b0b7c2c85/transition_words_for_body_paragraph_one.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/what_is_the_theme_of_ghosts_by_raina_telgemeier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61978844-1bee-404c-b0ab-d0903aa0912c/cuaderno_para_colorear_anatomia_netter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0629fc8d-5619-409e-b7eb-e2672282113e/marin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193e6450-f85e-4b32-abbd-907ad5f070bf/what_is_the_duration_of_ethical_hacking_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1737d5fa-a49c-4970-8d72-c8819e70b019/jekaxexezitomezur.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 5408 bytes
SHA-256: e3997af311f564654b434e2fa3bfc26887c81917b7918776be88d5aceed49c87
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10640 bytes
SHA-256: 6b4517d2145e27e2a916b5ddfa126f809083cb7adb2819ed7d39985bf7bb60ed

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