Malicious PDF — malware analysis report

Static analysis result for SHA-256 55056aa289f3d8a8…

MALICIOUS

PDF

90.8 KB Created: 2021-03-28 00:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d8f1bc929a37ae7909bba5c62c3600eb SHA-1: 52ada7ffc1ac2f95fc27ed77c68fb5dd7889eacc SHA-256: 55056aa289f3d8a8a53db7aaedebf548e1579613bd18b912249267f093658ce8
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, forming a link farm designed to obscure malicious redirectors. The primary malicious URL identified is 'https://yafferge.ru/wix?keyword=holt+french+1+bien+dit+textbook+answer+key', which is flagged as a known malicious redirector. The document's structure and the presence of numerous links suggest an attempt to trick users into visiting harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • 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://yafferge.ru/wix?keyword=holt+french+1+bien+dit+textbook+answer+key In PDF document text
    • https://cdn.sqhk.co/tobamozusaj/jghhc3U/98673551292.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/PQhjjeg/39657257735.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/Cjetjix/larry_miller_megaplex_theaters.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/hfhgvOm/fugipodigabovemeraxa.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/Pifijhf/galaxy_sky_shooting_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_3af6eb826a514ebbb0aa915fb12f9015.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_3c878da4cc60422182de1f8ae63c2c1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/troy_bilt_riding_lawn_mower_spark_plug_location.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_58ce6ab2e1db4438b23781682d5da42b.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_94f73ac85a6e42bcb2539daffa050956.pdf?index=trueIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_945d6410c0ff4e87b2db79991dabccce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/80_10_10_diet.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_9a804b57865a475893729d0ceccfebb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/aambala_video_songs_wapwon.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/fasuverelew.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/jofuxuxuzebokonetujod.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_f18fc6d7b9f9476ea932df34a8ea8b52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72cf6fe-bd20-4025-8c8b-7561a9891ebc/bakitovuwu.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_b5132a5f77964c93ad2decd5aab0fa92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/jujomewilefojax.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_674aff8bddbd4c818905350a11532a6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/healthiest_thing_to_get_at_bob_evans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ec2a90-fc9f-4876-b95e-0f72c68e16f7/how_to_put_ge_oven_door_back_together.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_1657be3c071048f5b3cdda6d4f204e06.pdf?index=trueIn 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_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 5588 bytes
SHA-256: 2d1799d8357c458ccb7aacce9d99d2cb6f18849a92870a1084981e92901b5966
font_01_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 11976 bytes
SHA-256: e726d199f003587702b90d2a71e09396e02c6b474ac117453d77b6b0fb6439a9

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