Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a1cf9d3df30bd4…

MALICIOUS

PDF

76.1 KB Created: 2021-03-10 12:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 33ccc37b77d6397f6fa432f04b42854e SHA-1: 27194baf3af5da22f7a587b73bd7abb0eee47e62 SHA-256: 42a1cf9d3df30bd49de0601419e8c4c6400842bf3f509b67199dbc295e0ab5bf
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=sadlier+oxford+vocab+level+e+unit+15+answers In PDF document text
    • https://bufotikebejunut.weebly.com/uploads/1/3/1/3/131398235/kodaledazepikitize.pdfIn PDF document text
    • http://kinoxca.xyz/39896671114uup74.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/tiguwunexibabax.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/7775144.pdfIn PDF document text
    • http://3203epworthcres.com/march_lesson_plan_ideas_for_toddlersitsjo.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/7041821.pdfIn PDF document text
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/vaburidage.pdfIn PDF document text
    • http://stakingyfi.com/megaman_the_power_battle_rom5uj8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/hp_officejet_pro_8500_a909g_driver_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/fuzumi.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/internet_censorship_ielts_reading_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/dajozusul.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/how_do_i_turn_on_num_lock_on_my_logitech_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/dobat.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/5925875202.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_3c906b5ef98440439ec07a47dac8107b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/56825066237.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/urdu_comprehension_worksheets_for_grade_3.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_a042d7c9067440f78502e8436409785d.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_eb509df803b844e185cea84fc0009606.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/ragged_mountain_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/21740295105.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/dovekapogekurexedezudikim.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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5652 bytes
SHA-256: e41e88db666b1a112f1860236f43f6b28ab8e692de33780f413612a33a66cab9
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 12288 bytes
SHA-256: 4e8dd7889be5c01b366067fe6bbee385a2746499bd7408a6ebca8ad7be841f3c

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