Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cab36a6061cf8df…

MALICIOUS

PDF

83.6 KB Created: 2021-04-04 00:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c21118f8513ac73ec2ecf6c56202bd2 SHA-1: 91cb554f04e8746cbba0356e852abca9149b6512 SHA-256: 5cab36a6061cf8df21f54a1905d5aa0edccfd8777a61c33109bb8dd8ea2b96d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/aws?utm_term=el+pollo+loco+nutrition+salad+dressing PDF link annotation
    • http://kupiokno.su/datawamegimigopipeoo0fe.pdfIn PDF document text
    • http://winnerslm.space/express_vpn_android_full_versionidp46.pdfIn PDF document text
    • https://rexizoxulod.weebly.com/uploads/1/3/5/3/135399206/firazudi.pdfIn PDF document text
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/fiwedadez.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/bible_chronology_timeline.pdfIn PDF document text
    • http://winoraama.space/just_wanted_to_say_hi_bernie40q3c.pdfIn PDF document text
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/tamepip_xaxowu_mijuxadadugud_nesabenulun.pdfIn PDF document text
    • http://tohld.in/burebemoxajonude1bi3f.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/1035634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea68e08-b57c-4a1b-9f27-c4625615403e/nogovivutusewameb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3c91b1-03db-4d7a-b995-2522f26e349d/how_do_you_really_win_the_lottery.pdfIn PDF document text
    • http://wepunulirepobi.myartsonline.com/89588654626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc897e0d-57f5-4906-85ed-7148ca95e88d/what_to_write_in_a_personal_development_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d37b70-517f-4a76-b2e2-707950aeca78/the_very_busy_spider_teaching_resources.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_0c5456f2d22c4e6e94ccc37440da4fbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d3095a-c8fb-4ded-9b5a-072527c35a0b/nawixobodadipexozono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b20f8ae-6912-4547-9c1b-678891845471/what_is_the_easiest_programming_language_to_learn_first.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_d9eee8b7350d45cc8647d53c3e280242.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49630487-3278-4b20-9209-f7e91b33a004/28993836745.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_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 5200 bytes
SHA-256: c5299f44acfabe23b9d1e3b60a3229472202e49f10ada68dc3b34de1977764ce
font_01_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 11560 bytes
SHA-256: f9585823c7c8cd36d62f3ea4975a3f31bb6b77da83106fff9b3428c271124570

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