Malicious PDF — malware analysis report

Static analysis result for SHA-256 5401633163908269…

MALICIOUS

PDF

78.9 KB Created: 2021-04-08 01:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a010fd6003be72ee7061252eb20bb19e SHA-1: 7ee6c91416856ce5d064b2105a4539645729a9bb SHA-256: 54016331639082691cbbd7c45624b189a582ae43f1efc0551875abeb98308af3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded external links, many of which point to suspicious domains. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/wix?keyword=chemistry+matter+and+change+answer+key+chapter+11
    • http://lnstagramverifiedbadge-media.com/290005155543f5x6.pdf
    • http://myluckybet.xyz/grammar_quiz_advancedfs1g7.pdf
    • http://a1metromovers.com/gulapopivusitoluduzisagoeit.pdf
    • https://fiwirozubaxezu.weebly.com/uploads/1/3/4/6/134659856/3390856.pdf
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/cdcf10c0cd49b.pdf
    • http://jusoxuz.iblogger.org/numezatilekinulafo.pdf
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/wobifixujikenededufo.pdf
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/vixuzewisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_c33b0e2f638d424ba855f1a697bda11d.pdf?index=true
    • https://s3.amazonaws.com/xefezesebusu/natububivubafija.pdf
    • https://s3.amazonaws.com/dovulavavo/96247933834.pdf
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_7e3cb99804b14f818c339ee55e60e304.pdf?index=true
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_776dea71fc5d42ce89a8aeb4108fd9a6.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_fb34b3eb69884482a602c424e89c3f63.pdf?index=true
    • https://8607b5f8-c2b2-49b7-a314-b17bd4efff40.filesusr.com/ugd/d99252_e8d527d6d63c4fbdadfb2fa39d2ccfa2.pdf?index=true
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_61f8d0dd7bf4466481e213e189d2467f.pdf?index=true
    • https://s3.amazonaws.com/wurivuve/a._c._a_full_form.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_975ef5f6fc174953a9d7f1e476ffec4d.pdf?index=true
    • http://xifenarubomes.rf.gd/98279967552.pdf
    • http://podawixixuxon.epizy.com/sagomezar.pdf
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_97403a7a236c48a2aadc439dbfee673c.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/65958525696.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f48c.bin
6c345cb142523a46c8cbe3ce71a270bf84683db9e97c1cc17bac2879a35a42ef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF48C 10496 bytes
font_00_sfnt_off0000e14c.bin
6a7a5334913e432de3ffb315eb1914217d84eb0f92d2de9ee33f9a4a49f60c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 5672 bytes
font_02_sfnt_off0001183d.bin
a1bdc24ec6dc0332449754d26803ee00bb6717469f64a18f47c680e22104396b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16080 bytes

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