Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0d613be58a4854…

MALICIOUS

PDF

76.3 KB Created: 2021-03-08 10:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c1c95ac4a3a104a05d71f65be4e9383 SHA-1: 75372a96c6c5e8b3761e4600cb9b1ac48c02bd78 SHA-256: 7e0d613be58a48547bc4ac1b73acd94f7cfbfcc1b9fdd1165e4bfa0dd35d8f0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm heuristic and numerous external URLs, including one pointing to 'nipisod.ru', suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards exploitation for client execution, likely initiated by user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=teaching+non+chronological+reports+year+4
    • https://cdn-cms.f-static.net/uploads/4384480/normal_60362cbc1bdbc.pdf
    • https://cdn-cms.f-static.net/uploads/4419637/normal_60245fc70d53e.pdf
    • https://cdn.sqhk.co/mugetawelumi/cVgdghC/dixomujipinanekir.pdf
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5ffb3c83b2b84.pdf
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5ff3693fcc2c3.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_601736cdf08c6.pdf
    • https://cdn.sqhk.co/sizebadit/Chex1P9/esl_play_clash_of_clans.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc8dbb9f-5e65-4b86-9c4c-769ac0a46c8d/sentry_valueguard_1250_safe_combination.pdf
    • https://uploads.strikinglycdn.com/files/2d07548d-4885-4c80-9b74-f6bf6b80cb89/war_and_peace_book_sparknotes.pdf
    • https://s3.amazonaws.com/nafamaragisek/wutijevikibesejawosuxa.pdf
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_8e33e8e0c18e422b9d8129d3ec131cfa.pdf?index=true
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_91a9cce6180c4e0f8f22ca9392a1a7dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b8143a9-cab0-4cf7-957d-c45542a407ce/is_a_masters_degree_in_information_technology_worth_it_reddit.pdf
    • https://uploads.strikinglycdn.com/files/7e8df5ac-08dd-44a2-9950-e028926b5512/95338821254.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/how_to_convert_garageband_to_midi.pdf
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_94c46e4180d742f2896c1911d98be8c2.pdf?index=true
    • https://s3.amazonaws.com/dewutexorob/ejercicios_de_comprension_lectora_para_nios_de_segundo_grado_de_primaria.pdf
    • https://s3.amazonaws.com/mefonevimimix/83153767468.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_cde8c5edfa034ea5884338010f9731ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f43e7cf9-2d44-442f-9a78-f408dc6ceb37/color_de_la_leche_materna_los_primeros_dias.pdf
    • https://uploads.strikinglycdn.com/files/a259c506-1f23-4b5a-b4b4-4ebde89fda0a/tissot_t_touch_review_expert.pdf
    • https://uploads.strikinglycdn.com/files/85a5f284-7d0e-499d-89a2-91304ee26daf/what_religion_is_allowed_in_china.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_fc61db0b8230455eacfa1557527def32.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed18.bin
c583723c8fdfa5173996fa048c4a86c753a929f1534c6aff644ab101eedf6de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 5336 bytes
font_01_sfnt_off0000ff41.bin
44d58285c5fb32f54adb259f997be4d99e2b1a8c3078dd23261f8606b23e83e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 10572 bytes

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