Malicious PDF — malware analysis report

Static analysis result for SHA-256 589ce89062c22f11…

MALICIOUS

PDF

79.9 KB Created: 2021-05-30 00:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b9eddf40ed35746a10e3a6205fc7fde SHA-1: 7f5f5a76635852e59e9547f2eee8e1c89902ca39 SHA-256: 589ce89062c22f11837a8bb005ba3e415ff00554d405ebfe33ab2a23b568bf2a
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+to+use+snapchat+filters+on+instagram+story In PDF document text
    • https://kedetasogo.weebly.com/uploads/1/3/4/5/134599644/muwusalifubogex_wekurepuriza_vozonujapakep.pdfIn PDF document text
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/mapagexeparamo_waruteseradudiw_gepobipiten.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/21eeb608.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/89d9ba04-120d-4ba1-b550-f29a3f033486/puwukubakopiwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14314b2-e326-4c97-8855-eff93db9475e/rite_of_summon_demon_witchery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef71cd8-e005-4c3a-9d00-0a06da44b9ba/lg_v20_android_9.0_pie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68b45c6-93e5-4f5c-a79d-a2f7f5865923/california_highway_39_closure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c813bc-48d4-434a-9d52-b80c8887c352/what_does_a_career_in_data_science_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b64108d-9514-466c-a313-b23003c26351/26122057602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a0d25d-b2cd-41ce-a250-9e8620750d58/56885813722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc70da1-287a-465a-a08d-aecf15c0a547/how_to_pair_bluetooth_turtle_beach_stealth_700_gen_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e4eeab-937a-4030-a77c-0b25ffc4bac7/gavaxetaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6864c478-c6d1-4fc5-bb88-32baddcd6264/how_to_replace_a_dryer_gas_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0ab486-034f-4bd5-9878-1bb10d9ee4bf/jovoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181369bc-cc44-44f1-a93c-cd1aa35a5e23/vavufotoruzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d533bac0-9fd3-44e0-b336-10d5d09f8163/48150405175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a257a879-5887-42fa-9e4f-41144ccac1ec/lesigekaxinurukux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921cb5a9-5d1b-4d74-8812-6a42e151cfa5/how_to_become_a_outboard_mechanic.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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 5584 bytes
SHA-256: d4c2d2bed46107671c50d18796653807290d6c0832e0a9369e15624c5c915f3e
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 11084 bytes
SHA-256: 45c778f0769d20cb7827866ccd3fefe5a1c447c4d76706af7c10071c00c14971