Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac888694c523a2d…

MALICIOUS

PDF

183.6 KB Created: 2021-06-15 12:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 447bc328f7a1050931b690212123ea23 SHA-1: 4708f6f2894fe6782eebcb862930b6f04d8f08fb SHA-256: fac888694c523a2df9edc14420e3c44cebd1d7a64217ac2ddd29730d8dc7d5ca
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a password-protected-archive lure. 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 0.9690

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/pbw?utm_term=bs+grewal+43rd+edition+solutions+pdf+free+download PDF link annotation
    • https://wovuwujofisup.weebly.com/uploads/1/3/1/8/131856276/rufivuxigiv-nilajuxu.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/limujut.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/pegujo_tujavola_niwulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://tujezowosop.pbworks.com/w/file/fetch/144737133/45635394085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dee68c-39e4-4941-a114-37592d8e509f/26049852083.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144630474/vameteludotodevinizun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c82c912-8242-4f71-b0e6-6bb28faa6250/emergency_care_and_transportation_of_the_sick_and_injured_11th_edition_answer_key.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144674190/computer_organization_and_design_risc-v_edition_solutions.pdfIn PDF document text
    • http://kimiwodevus.pbworks.com/f/toxegipipug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f25041-3ecc-402d-a08b-073daab3a99f/arduino_uno_r3__esp8266_wireless_wifi_shield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90495d2-6c2f-46ca-af4f-a0cf6715b986/how_to_adjust_temperature_on_rv_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3e568f-b141-4144-94e9-1769dbed3f50/128491754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8019ba7d-99bf-4b25-b25e-8c2df6b687b2/suzovezakesezomimovudiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0163c3-037a-45b7-af81-79c5fcff0304/10902325220.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144414294/vuxiwovadugugoteferu.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/angular_2_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfedfd8-f314-4d31-b763-fd680fceb9e7/69871303649.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144553539/patching_system_image_unconditionally_asus_zenfone_2_laser.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00029747.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29747 23776 bytes
SHA-256: f4e3bd7e8126673e44066544269125e28193a2b7f98360d5434a0cf74e05d03e
font_00_sfnt_off00020a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A59 13688 bytes
SHA-256: 2194eff535a91621f6155fd7fb5021aa004acbee7abac505b54fffa4a3b8c52f
font_01_sfnt_off00023777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23777 5600 bytes
SHA-256: 3d8d305c81df43ddc02bd92c0c06b3d9bc620f2c5caa1f6dbb800e34a02cdef0
font_02_sfnt_off00024ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AB0 3848 bytes
SHA-256: e4241ca059e9f8ca43985fb0f5d8f08de09d105be3227282ad6e58d1d51fdcaf
font_03_sfnt_off0002588d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2588D 2900 bytes
SHA-256: c5e2c1c7e68d2f71b46363c300bc42262963212c9d6ba65d922d08e04d963ed1
font_04_sfnt_off000264f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264F7 15976 bytes
SHA-256: 2bcadee2678c4548921481c4d850057942f4b0746844fb0e4cb57b446db63592
font_06_sfnt_off0002c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C15A 3420 bytes
SHA-256: 0a291fb965de59722434a6472547f35d80337c029049ac5904c81277acdf956d

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