Malicious PDF — malware analysis report

Static analysis result for SHA-256 838c90ad5cef5648…

MALICIOUS

PDF

84.7 KB Created: 2020-12-21 22:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ff6ce2278c398e289ab982c874e083c3 SHA-1: 85daf984301754b20f6e1d6800da90b27b3ebe43 SHA-256: 838c90ad5cef5648d09d0d0d59c857de5e0c0dbb07f7934d17780ec6724d7bbd
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for a malicious redirector link and a PDF link farm. The embedded content, though heavily obfuscated, appears to be a lure for search engine optimization, directing users to a malicious URL. The presence of numerous links, many pointing to benign AWS S3 buckets but one critical link to a known malicious redirector, suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=indoor+go+karts+near+me+prices In PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/vibebizoborilex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/keguzeketewalarevegej.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/40187584843.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/rise_and_shine_kylie_jenner.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/verbs_that_start_with_hydr.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/koxebajedanakima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebc4d4c-2a66-4910-ab75-af76c54b86bc/90288173585.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/wingsuit_flying_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6f5c7b-c013-4429-84b8-09f7a4111f4c/sojinikuzagubekojojameku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8ae9e3-5eaa-4d6e-8cc9-a7caae4eb128/wreck_it_ralph_2_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec0a7c7-7279-40b1-8fb0-2466c5f01a1b/wuwuzuwuladen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912d1333-fe7f-4117-abf5-eccc3b70dc50/.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56006abaecd3318401c97/t/5fd6504a313c42342b8a6b04/1607880779201/incisional_hernia_repair_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/benadarulosapipeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280f5bfd-c65b-48f2-a25f-36b03640aba0/reggie_level_editor_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bf4246-bd79-4cc7-87f7-d36f819f13a7/jelesivemi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3c1c3bd14ff0dd2ae6766/t/5fce1ed6920f47545bbb9caa/1607343831511/hello_dolly_recipe_variations.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 5360 bytes
SHA-256: 5533740fa2bdb732ecda3e35c71a6057ce7e82797b8d728e07547dbf39cf98e9
font_02_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 11132 bytes
SHA-256: ed6878a0498f2028a81390ff7a1152c7789e6987d2b50c46f37179e07f1db0a9
font_03_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 17452 bytes
SHA-256: d4eca1a88cba567ae138bf066d12a3be7e279d275345a8372a09091858030771
font_04_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 1736 bytes
SHA-256: 551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960