Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc41f7a70dc445e7…

MALICIOUS

PDF

93.6 KB Created: 2021-04-08 01:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e95fd13df64a7c64a79ffdc4389d50 SHA-1: 76d3d76e9fc1b9c3b84b4c21df025097f0cc40b9 SHA-256: dc41f7a70dc445e712089287a36dcf77e9c5ba9b1f2bc5cded9aeeed45f81cc2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to 30 external PDF files. One of the primary URLs, 'https://xezojetit.ru/strik?utm_term=photoshop+pdf+books+sinhala', suggests a lure related to 'photoshop pdf books sinhala'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xezojetit.ru/strik?utm_term=photoshop+pdf+books+sinhala
    • https://rogexufinijofe.weebly.com/uploads/1/3/1/1/131164439/f7f41e2d.pdf
    • http://hellesypakk.online/15249868893pvvl3.pdf
    • http://item-get.top/dirt_devil_power_max_xl_beltnldnc.pdf
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/7231668.pdf
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/8989833.pdf
    • http://cybety.xyz/774986713814e304.pdf
    • http://kemytbok.xyz/53473173513bqwni.pdf
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/1735747.pdf
    • http://hamsterbig.com/zodosinoxba870.pdf
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/goloxeraxe-nuduv-wamofus.pdf
    • http://7lessons.space/spanning_tree_protocol_process_steps5133y.pdf
    • https://duverovimuvojap.weebly.com/uploads/1/3/4/1/134131352/7154058.pdf
    • http://justiciaforjustice.com/guxudofabalimefoxawuketz0sfv.pdf
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/todawomiwes.pdf
    • http://9gusevshop.space/su_color_favorito_era_amarillo61gn1.pdf
    • http://freshmind.net/crossover_2006_movie_downloadchdvo.pdf
    • http://copyright-help-report.com/fibamuliw3qvnj.pdf
    • https://rawonosegapit.weebly.com/uploads/1/3/5/3/135314608/keweva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1fe1e883-2e61-46d8-8fae-839b2162971f/why_wont_my_microwave_fan_turn_off.pdf
    • https://uploads.strikinglycdn.com/files/9da55084-86d5-40dc-adde-88a57a312a6a/2370135867.pdf
    • https://uploads.strikinglycdn.com/files/11586334-7267-489c-bd57-fe19faabeb65/what_is_the_use_of_reference_voltage_in_adc.pdf
    • https://uploads.strikinglycdn.com/files/7e67d6d9-a543-4908-87d5-61306151a97b/jusabivutopagu.pdf
    • https://uploads.strikinglycdn.com/files/c06b4658-7820-42b3-9279-f9a285cb0ff2/xojorosujimogeji.pdf
    • https://uploads.strikinglycdn.com/files/fcebe4bd-0f3b-4838-aa89-b99302f10a08/schwinn_sidewinder_2.6_fs_purple.pdf
    • https://uploads.strikinglycdn.com/files/ef39f7a0-6c09-4159-b883-19dc63156189/speed_queen_stackable_washer_and_dryer_reviews.pdf
    • https://uploads.strikinglycdn.com/files/9e786d7c-5318-42dc-b273-458d2ea53efb/what_does_academy_mean_in_greek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012520.bin
10d7f861ba5aacd978754e1c580d772e535d3ea06476e31112d32ded20acf0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 4908 bytes
font_01_sfnt_off000135b3.bin
c03800af87b9efad91cf842f174dfd5d724bf4711a8f11c790ab4cd2c7363041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10812 bytes
font_02_sfnt_off00015a7c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7C 4324 bytes

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