Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f07ae00cdfba4a…

MALICIOUS

PDF

81.7 KB Created: 2021-05-04 00:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23de19e21de67c73a1c613d3b8e6ae33 SHA-1: bf089aa24107e700ef1aa0a35290bcefe4e41178 SHA-256: e1f07ae00cdfba4a47c37c255d66c1339b6f8ea3a1094aa917a0b177b70ae4fd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable infrastructure, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/strik?utm_term=jam+audio+transit+mini+bluetooth+earbuds In PDF document text
    • https://cdn.sqhk.co/gopilufifeda/ITgcvjd/angry_birds_cast_2.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/bLhcQvT/jojubejowisokigu.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/hegjnbu/40262477354.pdfIn PDF document text
    • http://ponafutinuko.22web.org/arap_bahar_nedir.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/iisjjji/photo_slideshow_with_music_app_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/lChfZjn/bass_booster_bluetooth_speaker_headphones_pro_apk.pdfIn PDF document text
    • http://wopazav.22web.org/16109165285.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/tjfiijb/scary_bildi_math_teacher_costume_t_shirt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/384a0b45-f922-4db4-a9cf-8310f5edc7a3/walmart_rosetta_stone_associate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072b541c-4d87-4036-9d8a-33a4486b61b5/public_relations_specialist_skills_and_competencies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0da0794-86f5-44a3-bba5-ca524e1dc5d2/how_can_you_tell_if_its_viral_or_bacterial_pink_eye.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/milasuxogemubuguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487930bd-77f0-4f34-b953-22943890e899/python_for_loop_list_reverse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ec0bbe-1d34-4c70-9462-063a0630080c/80130716089.pdfIn PDF document text
    • http://nidedos.rf.gd/isomerism_in_alkenes.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/76487208451.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/change_adt_alarm_code_safewatch_pro_3000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82027d66-5dea-4826-97a7-d34018dcb20f/how_to_work_the_bissell_proheat_pet.pdfIn PDF document text
    • http://silinodev.rf.gd/byzantine_architecture_characteristics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a0d62a-71de-488d-97aa-847850107f36/86426659892.pdfIn PDF document text
    • http://xopunuz.epizy.com/falls_lake_crappie_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b2f32b-7d84-427e-8f59-cc3306b6e3d0/87709307042.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/rusedan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c7ee63-4fbc-4a24-a4c1-4148b65b2486/15414985361.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011282.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11282 11296 bytes
SHA-256: c0ac686b7b2d12e98fa5a900308962097f375b3f4562a06447b7a6e4e0ee8e37
font_00_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 5196 bytes
SHA-256: 9b00b7f00bfa07a912aa9322186f1f492677d8bc897b8e613dcfc2e91b62c9df