Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aa87847198d466…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 20:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7788690474a07e2540c8728157bedf74 SHA-1: 62692821a0e1ae445cbba1b13ae89061413ae71c SHA-256: a8aa87847198d4667676f793b54b19b5964ee6fb35affd96d2cb2f8ec45da485
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a "PDF_SEO_LINK_FARM" heuristic. The primary URL, "https://botokaw.ru/wix?keyword=molecular+polarity+lab+worksheet", is presented as a worksheet to disguise the malicious intent. ClamAV also detected this file as "Pdf.Phishing.Trojan". The presence of numerous links suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=molecular+polarity+lab+worksheet
    • https://cdn.sqhk.co/busanurutar/jcReNgd/kitchen_story_cooking_game_mod_apk.pdf
    • https://cdn.sqhk.co/komifugu/jbhbiIS/final_fantasy_ii_psp_world_map.pdf
    • http://freshmind.net/33680540519co1uc.pdf
    • https://cdn.sqhk.co/zebapomiz/l8TRU2f/ben_10_episode.pdf
    • https://cdn.sqhk.co/gulizate/hlhbffv/hotel_slime_clicker_game.pdf
    • http://specialsale.info/xuzutukafabe4a9w8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c27ccf79-eb80-4814-b7f5-286ec58396f2/what_is_a_monasticism.pdf
    • https://uploads.strikinglycdn.com/files/2e72d610-32a3-4691-9786-35b5934517f7/elevator_pitch_worksheet_for_students.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_1b3b4f40855d41a9884ec9672afbd488.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c7d3675-569f-46a2-a92d-2f39dd3dcc14/79664111403.pdf
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_0c081175bd274343aca6586c494eb880.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_6795af53f70d47c18c4e1e358435cd5d.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/73885874910.pdf
    • https://uploads.strikinglycdn.com/files/fed035c9-d824-4f4a-8a65-b97614684d35/a_gentle_introduction_to_ros.pdf
    • https://s3.amazonaws.com/sixenogafopoj/79099256845.pdf
    • https://uploads.strikinglycdn.com/files/cac21738-97d0-4839-8876-9ef93990b9b8/starbucks_barista_espresso_machine_not_pumping_water.pdf
    • https://s3.amazonaws.com/tonemakopinibem/13185095994.pdf
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_6219b70152b44027b695c3379a75485c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5ae9866-778f-4b76-911b-63da261047d5/18515925662.pdf
    • https://s3.amazonaws.com/dumupa/fast_food_menu_template.pdf
    • https://uploads.strikinglycdn.com/files/6cb7b21a-3959-4cfc-8309-f4e52c4e2518/calorie_chart_for_vegetables_and_fruits.pdf
    • https://uploads.strikinglycdn.com/files/2656809d-8b2e-4672-8972-98221d11d3eb/why_does_my_denon_receiver_blink_red.pdf
    • https://uploads.strikinglycdn.com/files/0342305a-b899-4c39-a36b-6bb2c12e79b4/graco_magnum_x5_electric_airless_sprayer_review.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_off0000fd4a.bin
a4628029cc379ab5a89c81bddc16171401ad1176e8dd108cf46ce476f994d5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 5424 bytes
font_01_sfnt_off00010fd7.bin
9a65a37dcb33694bb5a651e32f21b77f43f4b4b4e42c543705dd3042eeccea33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 11220 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.