Malicious PDF — malware analysis report

Static analysis result for SHA-256 376593de8cbef6ca…

MALICIOUS

PDF

67.9 KB Created: 2021-04-07 16:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 18769fff1b9dea6e25a136bf4885a21b SHA-1: 7e4dd637563a168b7af4d0fd497d9b8a0f2d4f5f SHA-256: 376593de8cbef6ca71e92d91a060c177f5d3f5d4bd0cb734307c5e4f3da2c5ab
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to fixing air conditioner compressors, likely to disguise the malicious intent. The presence of multiple disposable domains and link farms further indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=how+to+fix+an+air+conditioner+compressor In PDF document text
    • http://aromaita.space/dadufogorijepakotosauzn39.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/area_of_all_shapes_geometry.pdfIn PDF document text
    • http://kuviruvada.getenjoyment.net/couper_logiciel.pdfIn PDF document text
    • https://cdn.sqhk.co/tesadubozino/idonii5/6843453817.pdfIn PDF document text
    • http://italy50wow.pro/omnisphere_2.5_updateww7b8.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/ii9jcjg/83337621134.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/leaf_by_niggle_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/UjPV2jc/little_adventures_unicorn.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/ifhhpRs/cut_the_apple_bow_arrow_knockdown_shoot_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/ehajchi/ar_catch_bag.pdfIn PDF document text
    • http://homeolimp.com/hp_photosmart_7760_photo_printer_driver_downloadurm6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukevoseworo.rf.gd/dot_art_printables.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_53d46bb83995439ea8e9d893bc722ecc.pdf?index=trueIn PDF document text
    • http://kugefosames.rf.gd/benim_hocam_matematik_tyt.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/fimoduwiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/89298671018.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/zutifovewufem.pdfIn PDF document text
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_fe02243c529b46019ecc197f5260416b.pdf?index=trueIn PDF document text
    • http://dopomiw.rf.gd/information_security_threat_management_definition.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_b7e906df181b419782e5b7b5f4a0da1c.pdf?index=trueIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_c2ed8fa99dde492893604794f8201f83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/13649631802.pdfIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_c0698b7da6b4408eb6e22bc11cbaccc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/the_great_gatsby_vocabulary_chapter_2_page_numbers.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
font_00_sfnt_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 5392 bytes
SHA-256: 7cc8d01dd24bcd7c645f11b81c8399834247dd3cb9f14d93ab75467b4f6cf66f
font_01_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 9800 bytes
SHA-256: 02c4586ddba44cb50726d6a438a291a57dc62d81815ce0215f05ca2e48598043