Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da7f2e6e0ae90e7…

MALICIOUS

PDF

86.7 KB Created: 2021-03-13 16:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b0e6445bb202a6828c1112a236fbb5ff SHA-1: b1664058ed408de8dc8d3608a81d8b176ce33f42 SHA-256: 7da7f2e6e0ae90e7d5eb802c8f9784b734f3191bdf7fc78203ee3af2ed3a8f2b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to 'Quimica organica e inorganica pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=quimica+organica+e+inorganica+pdf In PDF document text
    • http://jobs-ingenieur.best/how_to_start_a_new_paragraph_in_excel_cell29asc.pdfIn PDF document text
    • https://sipitajopidegol.weebly.com/uploads/1/3/1/4/131453448/rujamat.pdfIn PDF document text
    • http://phrensy.co/dexegovg4h4v.pdfIn PDF document text
    • http://leftoutclub.com/53010628445aru14.pdfIn PDF document text
    • http://ulekschool.online/infancy_gospel_of_thomas_download9kyxf.pdfIn PDF document text
    • http://biotringel.shop/839048797111tbgc.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/9603231.pdfIn PDF document text
    • http://load-bcp.com/stress_management_techniques5thd4.pdfIn PDF document text
    • http://copalofa.site/free_math_worksheets_multiplication_division_word_problems0en27.pdfIn PDF document text
    • http://termo-nord.tech/how_long_to_learn_algebra_15q0z1.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://s3.amazonaws.com/dumupa/lcd_16x2_datasheet_jhd162a.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_37fdd918e90d472385de600c5579e09b.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_ddde7aa9b5b44ce79fb6dcdf96109c0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9401f258-0d1a-418f-98f0-4082bdec2b02/le_petit_nicolas_louisette_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335475e7-2162-4532-b9f8-e0584a1fbf01/97517202929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5de4f6-dc1c-434e-b988-78b8db150742/1998_jeep_grand_cherokee_parts_catalog.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_61484ea46e554528a4e7c492a9fe0195.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_530265248b3d40a2a3d19e1759fe91c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/how_to_hook_up_a_waterboss_water_softener.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 5128 bytes
SHA-256: 900abd43f5bfcd371102dfe49da4f0378d4f9861078e253e3f661392a711bc64
font_01_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 12452 bytes
SHA-256: 67406e8f27e11809b218ce4d0f1f99742f3cd31f0bb22583ddf52155bf18658f
font_02_sfnt_off00013d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34