Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3c1831e5a3ded3…

MALICIOUS

PDF

101.5 KB Created: 2021-02-18 18:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a33b164d89aa6734ffdf546a25abb863 SHA-1: 84f9b1bc86f2439a19b9eb48e17a4d9481cee849 SHA-256: 0c3c1831e5a3ded3071869346f63efa61dbfbbf601b760ae82941d39f5112c17
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall heuristic firings point towards a phishing lure disguised as a search result for a book.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://bologen.ru/wb?keyword=soul%20keeping%20john%20ortberg%20pdf PDF link annotation
    • https://cdn.sqhk.co/somepizeko/yiibvue/primenap_free_sleep_tracker_for_apple_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_6028328baa1dd.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/byomkesh_bakshi_all_movie_free.pdfIn PDF document text
    • http://dunetetemob.22web.org/dance_practice_bts_fake_love_wapka.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/zdjfOij/bigepubuwas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fe90475cea0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380859/normal_5fe3b6faad804.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/6jck4gi/speed_tracker_gps_speedometer_pro_apk.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/miwov_moxaramebew_topemejuzixud.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/iegf76i/twitter_stock_forecast_zacks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_602af59187f6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutaluwuvekigo.rf.gd/free_printable_letter_p_template.pdfIn PDF document text
    • http://pafovipazatuk.rf.gd/51865339875.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/blue_baboon_tarantula_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/87605649261.pdfIn PDF document text
    • http://dibulazovila.rf.gd/930969823.pdfIn PDF document text
    • http://butevagowug.epizy.com/accounting_ratios_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/89782590171.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/python_check_string_matches_format.pdfIn PDF document text
    • http://jefelaxe.epizy.com/xejofarisodulixik.pdfIn PDF document text
    • http://gegokuberil.rf.gd/37521964093.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off000141a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00015196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15196 5300 bytes
SHA-256: 3bb1ac160a04afc4cdee06902171c1bcffbcac53bc3f86d077e288004739f45b
font_02_sfnt_off00016399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 10616 bytes
SHA-256: 3578399f065fc2b9f6aa5f1a46cb66b73222cd338c94a8cd1017d1e36b5bb69e

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