Malicious PDF — malware analysis report

Static analysis result for SHA-256 514728e48d564421…

MALICIOUS

PDF

82.6 KB Created: 2021-03-29 21:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 536ffb885da8714ce3a6f876f3a54e3d SHA-1: bf132ee98751b97e8e2cd203c5a9bf2b48da8f0b SHA-256: 514728e48d5644213efc4a5c89900d84c783ca9b7ca1c94e6290a73362a6b3e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://mezovuduw.ru/strik?utm_term=how+to+replace+samsung+refrigerator+water+filter+housing', appears to be a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+replace+samsung+refrigerator+water+filter+housing PDF link annotation
    • http://wordsideget.top/58836454261vm1hn.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/sewajogop.pdfIn PDF document text
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/5077809.pdfIn PDF document text
    • http://importants.space/silitexozadsu588.pdfIn PDF document text
    • http://meetsol.xyz/67297577603av4ci.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/wabit99mv5.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/nanukezu-lawamuxa-nawiwikod.pdfIn PDF document text
    • https://sowodelomix.weebly.com/uploads/1/3/5/3/135315299/a67bfa.pdfIn PDF document text
    • http://morpeoplelife.ru/59394728482a4dw1.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/b4e507bf-e9f7-4e74-9835-ba5c2eb7a858/80558423924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338bec84-10a1-4dc2-9993-1a0adc913d52/xeziwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39551a24-f63c-4230-a486-f201c5f04d4d/magnus_chase_and_the_gods_of_asgard_chapter_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/lion_king_coloring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/piraba.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_a27fbfa0a17f4a9ca65ee2c66a82f7a1.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_3e12354728b44353ab3604ac148578dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/were_going_on_a_bear_hunt_kid_song.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_d65c7700ce0c43489773b9d0644a5ad5.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_e2e2168c21cb40fd931316b7ba576a91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/what_happens_in_the_couple_next_door_book.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/73738498403.pdfIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_a7056f65ae72434091f740d5adf8b42e.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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5480 bytes
SHA-256: 6d0ae546effebbb63067f9154ae80f2ff88b07dead52a052103f67c4c9d6e54a
font_01_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 10680 bytes
SHA-256: f91422c46669d4a09056952562c957663144df036609077742de51d676bae3f3

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