Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edcd1c89833170a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-12 15:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0af52344d0473dfec54151384441fb7 SHA-1: dbcb5080680193e12683999ce0bef9b227f89477 SHA-256: 0edcd1c89833170a67a96cd70d1dadb8b28b29562dcdd19ad1891c2d5894fd66
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=bethesda+system+for+reporting+cervical+cytology+2020+pdf
    • https://cdn.sqhk.co/bisuligiga/J6U1Pji/liverpool_football_club_news_now.pdf
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/4633882.pdf
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/zusotisorimedow.pdf
    • https://kilobabax.weebly.com/uploads/1/3/1/8/131856311/02a67d.pdf
    • https://cdn.sqhk.co/wabogoga/hgkD9gd/10152862535.pdf
    • https://mosevulex.weebly.com/uploads/1/3/4/8/134860143/ca2f17dfbabc09.pdf
    • https://cdn.sqhk.co/pufuxogife/jchhYhb/mobile_home_electrical_box.pdf
    • https://cdn.sqhk.co/ramidazumiko/aMgch1f/petrolhead_paradise_hack_ios.pdf
    • https://cdn.sqhk.co/zofonabiz/ghvqxfb/last_cloudia_tier_list_2020_jp.pdf
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/jovemarawifinonar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d913db1-4449-4ca3-b4c7-0b9af2b29cab/windows_server_2012_r2_unleashed_download.pdf
    • https://uploads.strikinglycdn.com/files/228ee32f-1887-468f-ac99-fbb121149589/kaluworajanomuxixi.pdf
    • https://uploads.strikinglycdn.com/files/8df9295a-3a44-46b3-9668-a2ef9706cf34/necchi_sewing_machine_feet_guide.pdf
    • https://uploads.strikinglycdn.com/files/b992917d-df8e-4b20-8421-ae35aa9e0c31/lola_and_the_boy_next_door_audiobook_free.pdf
    • https://uploads.strikinglycdn.com/files/dcf8c856-ef81-4e60-8061-98caba581fae/telugu_short_stories.pdf
    • https://uploads.strikinglycdn.com/files/4aff3c5f-52eb-4444-a8e0-d4353afa7f31/70404108853.pdf
    • https://uploads.strikinglycdn.com/files/7e634978-bbb0-4c3e-9d53-29b22a178f3c/78026956325.pdf
    • https://uploads.strikinglycdn.com/files/e034bef9-63d3-4646-b441-452251b4ada0/42407567882.pdf
    • https://uploads.strikinglycdn.com/files/f4de8992-5754-4207-9acd-3e3ffc6b72b0/how_long_to_watch_all_of_the_lord_of_the_rings.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_off0000f10f.bin
09c70c380f4d9fcbc2f29eabf57b7a3f74962aa9a40d2524f35237b6a04fc388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 6052 bytes
font_01_sfnt_off00010594.bin
83f9f96ede5746d286f2717a497dff914bd18fd7ca3d562fff3418444419790a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10292 bytes

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