Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c2d5b249e538c1…

MALICIOUS

PDF

81.4 KB Created: 2021-03-21 08:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da0b253a4373a20312e71a03b4836554 SHA-1: d084ef409bd5f01cbf500a0357b7d03f77769d71 SHA-256: f2c2d5b249e538c1f0c67a572a3a7e6dc1ef27d7dd81a2872364893623249209
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/wix?keyword=business+models+for+dummies+pdf+free+download PDF link annotation
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/diralowupala.pdfIn PDF document text
    • https://fekipasipoxow.weebly.com/uploads/1/3/1/6/131637207/2a6fd421e707b2.pdfIn PDF document text
    • http://construt.site/senator_blumenthal_contact_informationzgiwg.pdfIn PDF document text
    • http://cocobeautybar.ca/how_to_take_permit_test_online_georgiav8h45.pdfIn PDF document text
    • https://patijunig.weebly.com/uploads/1/3/0/9/130969449/zirosalegibopojedu.pdfIn PDF document text
    • http://olymp-trade.top/roserudurarouop92.pdfIn PDF document text
    • http://artistichomesolutions.com/gutapawumobomepapodew5e7m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48c8e1f4-bc7c-49b4-a9b7-27b77d1b55b6/my_cloud_home_personal_cloud_storage_4tb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2830fa06-b81d-41cd-9a0c-c1d416e5eeb6/56048543736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2ad669-834a-47d4-adc1-b5d6bd23d660/difference_between_viral_and_bacterial_pneumonia.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/bogan_tamil_movie_cinemavilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70747d29-795a-4d4b-b9e2-76825ee873c2/89433442284.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/beginning_cryptography_with_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5006f0-f90c-469c-855f-20927a4e84a4/kumara_satakam_poems_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325eeae0-3934-4772-a607-6e480f5bcbf9/92908840959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a658fc7-1e35-4b01-9476-1a5a6eacd0dd/jarefixivupatilugagetin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020844f6-d506-4366-a731-aaa2b69f183d/relion_blood_pressure_monitor_hem-741crel.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/ffxiv_white_mage_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/remington_700_308_tactical_bolt_handle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b29adc3-85e5-42ed-b446-27bfbc492fdd/hebrew_and_greek_bible_dictionary_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fa3293-52e2-4365-a5be-8562568bb718/c_programming_software_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3db743-2ef8-4c94-8ed4-dd47571ee083/how_to_clean_uppababy_vista_rumble_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/49063633407.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 5128 bytes
SHA-256: b42447a63af404aa359fa6488f725c68a5e30f32b4d373997a002796db867e0b
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 3052 bytes
SHA-256: 3139288e60f9483e6d34cc8635d7806b8904439c56ac0e7b4fc65e53a65e76b6
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 11844 bytes
SHA-256: f6d4129bf0947602e8f7f0e2db1bed4bd47a1a8b201257d9b87bbad69f2c7126
font_03_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378