Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3835691b3edd07d…

MALICIOUS

PDF

79.2 KB Created: 2021-06-12 21:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9dcac134cce3823e2d2513212e1cd0b SHA-1: 00ddbdda26ceae37998042eda7ad28bfd9e493ff SHA-256: d3835691b3edd07d42475d82bafa9c3852cd95babf118f601bd73d54fec52633
134 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a lure for 'physics important formulas for neet', likely a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/pbw?utm_term=physics+important+formulas+for+neet PDF link annotation
    • https://mufikufit.weebly.com/uploads/1/3/4/7/134766202/wivagul.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/nesuxurizu.pdfIn PDF document text
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/de1b05e9.pdfIn PDF document text
    • https://dawopurasujup.weebly.com/uploads/1/3/0/7/130775219/lebigabafom_ligebit_virivikidusexul.pdfIn PDF document text
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/6289449.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/6885315.pdfIn PDF document text
    • https://tirawinuzupufe.weebly.com/uploads/1/3/4/4/134445233/wukopizefaliko-kowijelifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gifavipa.pbworks.com/f/24503732210.pdfIn PDF document text
    • http://zuguwar.pbworks.com/w/file/fetch/144708768/tamilrockers_isaimini_2019_tamil_movies_free_download_hd.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144792723/kebobasemasuv.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/145071207/raabta_female_song_download.pdfIn PDF document text
    • http://metukamef.pbworks.com/f/25699059679.pdfIn PDF document text
    • http://nalujoxerisi.pbworks.com/w/file/fetch/144712524/25234012962.pdfIn PDF document text
    • http://tomabekaf.pbworks.com/w/file/fetch/145184718/download_naruto_ultimate_ninja_storm_3_android.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/w/file/fetch/144948717/28758639443.pdfIn PDF document text
    • http://fozujedax.pbworks.com/w/file/fetch/144896556/online_dwf_to_dwg_converter.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411741/fubebomeperoxavapitib.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144640551/technical_drawing_textbook_for_senior_secondary_school.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/f/kuwanopajonolikagotedu.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/how_to_clean_instant_pot_duo_crisp_air_fryer_lid.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_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 5360 bytes
SHA-256: 3fbfff2766712503fda1be3b57fbe8098f1c4ad633d701e1d140aaa44b891076
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 11176 bytes
SHA-256: 583368fa1cb3aaca1c17bcaf981b036d764141ba814843f11584625cc8db13d0

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